diff --git a/2meet-data-optimizer.php b/2meet-data-optimizer.php
index 1e41e67..4f6b5c5 100644
--- a/2meet-data-optimizer.php
+++ b/2meet-data-optimizer.php
@@ -19,6 +19,8 @@
  * @package TMDO
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/admin/class-tmdo-admin.php b/admin/class-tmdo-admin.php
index c20b037..bf7b939 100644
--- a/admin/class-tmdo-admin.php
+++ b/admin/class-tmdo-admin.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform admin UI: native meta queries for management dashboard
 /**
  * WP Data Optimizer admin UI class.
diff --git a/admin/class-tmdo-dashboard-widget.php b/admin/class-tmdo-dashboard-widget.php
index 577199a..1be472b 100644
--- a/admin/class-tmdo-dashboard-widget.php
+++ b/admin/class-tmdo-dashboard-widget.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform admin UI: native postmeta count for dashboard widget
 /**
  * TMDO_Dashboard_Widget — wp-admin home dashboard widget (v2.4.0 M9).
diff --git a/admin/class-tmdo-export.php b/admin/class-tmdo-export.php
index eea536a..e40699a 100644
--- a/admin/class-tmdo-export.php
+++ b/admin/class-tmdo-export.php
@@ -15,6 +15,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/admin/class-tmdo-help-tabs.php b/admin/class-tmdo-help-tabs.php
index 26dad11..54bc9b7 100644
--- a/admin/class-tmdo-help-tabs.php
+++ b/admin/class-tmdo-help-tabs.php
@@ -14,6 +14,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/admin/class-tmdo-setup-wizard.php b/admin/class-tmdo-setup-wizard.php
index f468219..49357d1 100644
--- a/admin/class-tmdo-setup-wizard.php
+++ b/admin/class-tmdo-setup-wizard.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform admin UI: postmeta inventory for setup wizard
 /**
  * TMDO_Setup_Wizard — First-run onboarding wizard (v2.3.0 M5).
diff --git a/admin/templates/comment-stress-test.php b/admin/templates/comment-stress-test.php
index 1f838e8..94ede60 100644
--- a/admin/templates/comment-stress-test.php
+++ b/admin/templates/comment-stress-test.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform admin UI: stress test SQL example display
 /**
  * Comment Stress Test template (v2.13.1).
diff --git a/admin/templates/migration-wizard.php b/admin/templates/migration-wizard.php
index d736601..ac972d5 100644
--- a/admin/templates/migration-wizard.php
+++ b/admin/templates/migration-wizard.php
@@ -10,6 +10,8 @@
  * @since 2.8.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/admin/templates/post-migration-wizard.php b/admin/templates/post-migration-wizard.php
index d467bec..ed5fc84 100644
--- a/admin/templates/post-migration-wizard.php
+++ b/admin/templates/post-migration-wizard.php
@@ -13,6 +13,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/admin/templates/post-stress-test.php b/admin/templates/post-stress-test.php
index f61206a..feed3fb 100644
--- a/admin/templates/post-stress-test.php
+++ b/admin/templates/post-stress-test.php
@@ -16,6 +16,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/admin/templates/term-stress-test.php b/admin/templates/term-stress-test.php
index b418d7d..a6611cb 100644
--- a/admin/templates/term-stress-test.php
+++ b/admin/templates/term-stress-test.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform admin UI: stress test SQL example display
 /**
  * Term Stress Test template (v2.13.0).
diff --git a/cli/class-tmdo-cli-member.php b/cli/class-tmdo-cli-member.php
index e89d090..9058250 100644
--- a/cli/class-tmdo-cli-member.php
+++ b/cli/class-tmdo-cli-member.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform CLI inspector tool: raw meta queries needed for diagnostics
 /**
  * TMDO_CLI_Member — Member flat-table CLI subcommands.
diff --git a/cli/class-tmdo-cli-post.php b/cli/class-tmdo-cli-post.php
index b45f955..7a02a56 100644
--- a/cli/class-tmdo-cli-post.php
+++ b/cli/class-tmdo-cli-post.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform CLI inspector tool: raw meta queries needed for diagnostics
 /**
  * TMDO_CLI_Post — Post entity CLI subcommands (v2.9.0+).
diff --git a/cli/class-tmdo-cli-term-comment.php b/cli/class-tmdo-cli-term-comment.php
index 4fa3b6c..53233c8 100644
--- a/cli/class-tmdo-cli-term-comment.php
+++ b/cli/class-tmdo-cli-term-comment.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform CLI inspector tool: raw meta queries needed for diagnostics
 /**
  * TMDO_CLI_Term_Comment — Term + Comment entity CLI subcommands (v2.12.0+).
diff --git a/cli/class-tmdo-cli-v2.php b/cli/class-tmdo-cli-v2.php
index 5d59a5f..986e420 100644
--- a/cli/class-tmdo-cli-v2.php
+++ b/cli/class-tmdo-cli-v2.php
@@ -19,6 +19,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/cli/class-tmdo-cli.php b/cli/class-tmdo-cli.php
index db195d2..822d5f9 100644
--- a/cli/class-tmdo-cli.php
+++ b/cli/class-tmdo-cli.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/adapters/class-tmdo-adapter-comment.php b/includes/adapters/class-tmdo-adapter-comment.php
index fdc38ec..dbe44be 100644
--- a/includes/adapters/class-tmdo-adapter-comment.php
+++ b/includes/adapters/class-tmdo-adapter-comment.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/adapters/class-tmdo-adapter-post.php b/includes/adapters/class-tmdo-adapter-post.php
index 6c5bdcd..d56bc21 100644
--- a/includes/adapters/class-tmdo-adapter-post.php
+++ b/includes/adapters/class-tmdo-adapter-post.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/adapters/class-tmdo-adapter-term.php b/includes/adapters/class-tmdo-adapter-term.php
index 0a6379d..1a06ad9 100644
--- a/includes/adapters/class-tmdo-adapter-term.php
+++ b/includes/adapters/class-tmdo-adapter-term.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/adapters/class-tmdo-adapter-user.php b/includes/adapters/class-tmdo-adapter-user.php
index 8d1df01..7d8b01d 100644
--- a/includes/adapters/class-tmdo-adapter-user.php
+++ b/includes/adapters/class-tmdo-adapter-user.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/adapters/interface-entity-adapter.php b/includes/adapters/interface-entity-adapter.php
index fe86d55..d85a30d 100644
--- a/includes/adapters/interface-entity-adapter.php
+++ b/includes/adapters/interface-entity-adapter.php
@@ -8,6 +8,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/advisor/class-tmdo-fsm-advisor.php b/includes/advisor/class-tmdo-fsm-advisor.php
index 5cd666f..f96f099 100644
--- a/includes/advisor/class-tmdo-fsm-advisor.php
+++ b/includes/advisor/class-tmdo-fsm-advisor.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform diagnostic: raw meta inspection for FSM state advisor
 /**
  * TMDO_FSM_Advisor — Recommends the next FSM state per module (v2.4.0 M12).
diff --git a/includes/advisor/class-tmdo-fsm-automator.php b/includes/advisor/class-tmdo-fsm-automator.php
index ecc397c..40d507d 100644
--- a/includes/advisor/class-tmdo-fsm-automator.php
+++ b/includes/advisor/class-tmdo-fsm-automator.php
@@ -20,6 +20,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/advisor/class-tmdo-module-detector.php b/includes/advisor/class-tmdo-module-detector.php
index fec9947..b8727c4 100644
--- a/includes/advisor/class-tmdo-module-detector.php
+++ b/includes/advisor/class-tmdo-module-detector.php
@@ -18,6 +18,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/advisor/class-tmdo-module-rules.php b/includes/advisor/class-tmdo-module-rules.php
index e88eedf..fd9011e 100644
--- a/includes/advisor/class-tmdo-module-rules.php
+++ b/includes/advisor/class-tmdo-module-rules.php
@@ -17,6 +17,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/back-compat/interface-wpdo-entity-adapter-alias.php b/includes/back-compat/interface-wpdo-entity-adapter-alias.php
index 470b891..bbce411 100644
--- a/includes/back-compat/interface-wpdo-entity-adapter-alias.php
+++ b/includes/back-compat/interface-wpdo-entity-adapter-alias.php
@@ -14,6 +14,8 @@
  * @since   0.1.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/back-compat/trait-wpdo-anti-eav-aware-alias.php b/includes/back-compat/trait-wpdo-anti-eav-aware-alias.php
index c42c5ae..d000f5f 100644
--- a/includes/back-compat/trait-wpdo-anti-eav-aware-alias.php
+++ b/includes/back-compat/trait-wpdo-anti-eav-aware-alias.php
@@ -14,6 +14,8 @@
  * @since   0.1.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-api.php b/includes/class-tmdo-api.php
index e463435..7d818aa 100644
--- a/includes/class-tmdo-api.php
+++ b/includes/class-tmdo-api.php
@@ -19,6 +19,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-back-compat.php b/includes/class-tmdo-back-compat.php
index e1513f0..47ebf69 100644
--- a/includes/class-tmdo-back-compat.php
+++ b/includes/class-tmdo-back-compat.php
@@ -9,6 +9,8 @@
  * @package TMDO
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-cache-layer.php b/includes/class-tmdo-cache-layer.php
index 8a14909..db21ce9 100644
--- a/includes/class-tmdo-cache-layer.php
+++ b/includes/class-tmdo-cache-layer.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-capability.php b/includes/class-tmdo-capability.php
index d61030a..bec0f86 100644
--- a/includes/class-tmdo-capability.php
+++ b/includes/class-tmdo-capability.php
@@ -20,6 +20,8 @@
  * @since 2.14.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-comment-stress-tester.php b/includes/class-tmdo-comment-stress-tester.php
index f7cb248..4ee7abf 100644
--- a/includes/class-tmdo-comment-stress-tester.php
+++ b/includes/class-tmdo-comment-stress-tester.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform stress tester: intentional raw meta SQL for baseline comparison
 /**
  * TMDO_Comment_Stress_Tester — Async stress fixture generator for comment entity (v2.13.1).
diff --git a/includes/class-tmdo-commentmeta-cleaner.php b/includes/class-tmdo-commentmeta-cleaner.php
index 2c75650..66f85af 100644
--- a/includes/class-tmdo-commentmeta-cleaner.php
+++ b/includes/class-tmdo-commentmeta-cleaner.php
@@ -20,6 +20,8 @@
  * @since   2.12.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-compatibility.php b/includes/class-tmdo-compatibility.php
index 73284e8..a9e0d1c 100644
--- a/includes/class-tmdo-compatibility.php
+++ b/includes/class-tmdo-compatibility.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-conflict-monitor.php b/includes/class-tmdo-conflict-monitor.php
index 25a0ee6..69d1be2 100644
--- a/includes/class-tmdo-conflict-monitor.php
+++ b/includes/class-tmdo-conflict-monitor.php
@@ -18,6 +18,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-core.php b/includes/class-tmdo-core.php
index 58906b9..781c745 100644
--- a/includes/class-tmdo-core.php
+++ b/includes/class-tmdo-core.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-crypto.php b/includes/class-tmdo-crypto.php
index c416790..e47f32d 100644
--- a/includes/class-tmdo-crypto.php
+++ b/includes/class-tmdo-crypto.php
@@ -28,6 +28,8 @@
  * @since   2.15.0 (v2 GCM, AEAD authentication)
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-custom-table-registry.php b/includes/class-tmdo-custom-table-registry.php
index d95bdd9..ef04528 100644
--- a/includes/class-tmdo-custom-table-registry.php
+++ b/includes/class-tmdo-custom-table-registry.php
@@ -15,6 +15,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-db.php b/includes/class-tmdo-db.php
index 1b2da94..7d7f49d 100644
--- a/includes/class-tmdo-db.php
+++ b/includes/class-tmdo-db.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-feature-flags.php b/includes/class-tmdo-feature-flags.php
index 6e0a632..d33ccd1 100644
--- a/includes/class-tmdo-feature-flags.php
+++ b/includes/class-tmdo-feature-flags.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-hook-bus-bridge.php b/includes/class-tmdo-hook-bus-bridge.php
index b76fd9b..02517bc 100644
--- a/includes/class-tmdo-hook-bus-bridge.php
+++ b/includes/class-tmdo-hook-bus-bridge.php
@@ -19,6 +19,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-installer.php b/includes/class-tmdo-installer.php
index fd0274d..b2c9c89 100644
--- a/includes/class-tmdo-installer.php
+++ b/includes/class-tmdo-installer.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-logger.php b/includes/class-tmdo-logger.php
index 5f41696..324cf38 100644
--- a/includes/class-tmdo-logger.php
+++ b/includes/class-tmdo-logger.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-post-shadow-verifier.php b/includes/class-tmdo-post-shadow-verifier.php
index 3961c33..0f40824 100644
--- a/includes/class-tmdo-post-shadow-verifier.php
+++ b/includes/class-tmdo-post-shadow-verifier.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform shadow verifier: must read raw meta to verify zone correctness
 /**
  * TMDO_Post_Shadow_Verifier — Sample-and-compare flat vs wp_postmeta (v2.10.3).
diff --git a/includes/class-tmdo-post-stress-tester.php b/includes/class-tmdo-post-stress-tester.php
index 982acb4..046c393 100644
--- a/includes/class-tmdo-post-stress-tester.php
+++ b/includes/class-tmdo-post-stress-tester.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform stress tester: intentional raw meta SQL for baseline comparison
 /**
  * TMDO_Post_Stress_Tester — Bulk fixture generator for post entity migration (v2.9.4).
diff --git a/includes/class-tmdo-postmeta-cleaner.php b/includes/class-tmdo-postmeta-cleaner.php
index e7e9a16..67a5120 100644
--- a/includes/class-tmdo-postmeta-cleaner.php
+++ b/includes/class-tmdo-postmeta-cleaner.php
@@ -19,6 +19,8 @@
  * @since   2.9.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-rest-api.php b/includes/class-tmdo-rest-api.php
index 416bc94..bb34b14 100644
--- a/includes/class-tmdo-rest-api.php
+++ b/includes/class-tmdo-rest-api.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-routing-predicate.php b/includes/class-tmdo-routing-predicate.php
index fb45dbe..12ae45c 100644
--- a/includes/class-tmdo-routing-predicate.php
+++ b/includes/class-tmdo-routing-predicate.php
@@ -15,6 +15,8 @@
  * @since 0.2.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-safe-unserialize.php b/includes/class-tmdo-safe-unserialize.php
index 9dc0147..0deb76d 100644
--- a/includes/class-tmdo-safe-unserialize.php
+++ b/includes/class-tmdo-safe-unserialize.php
@@ -19,6 +19,8 @@
  * @since 2.13.3
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-schema-registry.php b/includes/class-tmdo-schema-registry.php
index 971b552..44ff201 100644
--- a/includes/class-tmdo-schema-registry.php
+++ b/includes/class-tmdo-schema-registry.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-sqlite-compat.php b/includes/class-tmdo-sqlite-compat.php
index 60ebd0f..012b699 100644
--- a/includes/class-tmdo-sqlite-compat.php
+++ b/includes/class-tmdo-sqlite-compat.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-term-comment-backfill.php b/includes/class-tmdo-term-comment-backfill.php
index 1bee04f..c2b0540 100644
--- a/includes/class-tmdo-term-comment-backfill.php
+++ b/includes/class-tmdo-term-comment-backfill.php
@@ -46,6 +46,8 @@
  * @since   2.12.6
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-term-comment-shadow-verifier.php b/includes/class-tmdo-term-comment-shadow-verifier.php
index 9ec855b..89cf246 100644
--- a/includes/class-tmdo-term-comment-shadow-verifier.php
+++ b/includes/class-tmdo-term-comment-shadow-verifier.php
@@ -22,6 +22,8 @@
  * @since   2.12.5
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-term-stress-tester.php b/includes/class-tmdo-term-stress-tester.php
index eb5852d..e83e7c9 100644
--- a/includes/class-tmdo-term-stress-tester.php
+++ b/includes/class-tmdo-term-stress-tester.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform stress tester: intentional raw meta SQL for baseline comparison
 /**
  * TMDO_Term_Stress_Tester — Async stress fixture generator for term entity (v2.13.0).
diff --git a/includes/class-tmdo-termmeta-cleaner.php b/includes/class-tmdo-termmeta-cleaner.php
index 1f6aa90..4473b76 100644
--- a/includes/class-tmdo-termmeta-cleaner.php
+++ b/includes/class-tmdo-termmeta-cleaner.php
@@ -20,6 +20,8 @@
  * @since   2.12.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-user-stress-tester.php b/includes/class-tmdo-user-stress-tester.php
index 9993e5b..66d7dba 100644
--- a/includes/class-tmdo-user-stress-tester.php
+++ b/includes/class-tmdo-user-stress-tester.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform stress tester: intentional raw meta SQL for baseline comparison
 /**
  * TMDO_User_Stress_Tester — User entity 壓力測試 / Benchmark 工具
diff --git a/includes/class-tmdo-v2-upgrader.php b/includes/class-tmdo-v2-upgrader.php
index 09ffe99..94c59ba 100644
--- a/includes/class-tmdo-v2-upgrader.php
+++ b/includes/class-tmdo-v2-upgrader.php
@@ -21,6 +21,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/class-tmdo-zone-classifier.php b/includes/class-tmdo-zone-classifier.php
index f6cbc32..130a70f 100644
--- a/includes/class-tmdo-zone-classifier.php
+++ b/includes/class-tmdo-zone-classifier.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/diagnostic/class-tmdo-health-cron.php b/includes/diagnostic/class-tmdo-health-cron.php
index bed04f3..3bf0e66 100644
--- a/includes/diagnostic/class-tmdo-health-cron.php
+++ b/includes/diagnostic/class-tmdo-health-cron.php
@@ -21,6 +21,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/diagnostic/class-tmdo-monthly-summary.php b/includes/diagnostic/class-tmdo-monthly-summary.php
index b54d9f4..bf3c8c6 100644
--- a/includes/diagnostic/class-tmdo-monthly-summary.php
+++ b/includes/diagnostic/class-tmdo-monthly-summary.php
@@ -17,6 +17,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/diagnostic/class-tmdo-site-health.php b/includes/diagnostic/class-tmdo-site-health.php
index c11abfc..1ea9e2e 100644
--- a/includes/diagnostic/class-tmdo-site-health.php
+++ b/includes/diagnostic/class-tmdo-site-health.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform diagnostic: raw meta inspection for site health
 /**
  * TMDO_Site_Health — WordPress Site Health integration (v2.2.0 M3).
diff --git a/includes/diagnostic/class-tmdo-site-metrics-collector.php b/includes/diagnostic/class-tmdo-site-metrics-collector.php
index f7fb0ae..bb1c9ef 100644
--- a/includes/diagnostic/class-tmdo-site-metrics-collector.php
+++ b/includes/diagnostic/class-tmdo-site-metrics-collector.php
@@ -19,6 +19,8 @@
  * @since   2.6.2
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/engine/class-tmdo-audit-logger.php b/includes/engine/class-tmdo-audit-logger.php
index f589e7f..4e93202 100644
--- a/includes/engine/class-tmdo-audit-logger.php
+++ b/includes/engine/class-tmdo-audit-logger.php
@@ -17,6 +17,8 @@
  * @since   1.3.0
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-auto-promoter.php b/includes/engine/class-tmdo-auto-promoter.php
index 1971bbb..5f3983a 100644
--- a/includes/engine/class-tmdo-auto-promoter.php
+++ b/includes/engine/class-tmdo-auto-promoter.php
@@ -20,6 +20,8 @@
  * @since   1.5.0
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-cache-orchestrator.php b/includes/engine/class-tmdo-cache-orchestrator.php
index 65da265..232cbb8 100644
--- a/includes/engine/class-tmdo-cache-orchestrator.php
+++ b/includes/engine/class-tmdo-cache-orchestrator.php
@@ -10,6 +10,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-conflict-detector.php b/includes/engine/class-tmdo-conflict-detector.php
index 4252a4e..b8da9bc 100644
--- a/includes/engine/class-tmdo-conflict-detector.php
+++ b/includes/engine/class-tmdo-conflict-detector.php
@@ -19,6 +19,8 @@
  * @since   1.1.2
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-entity-health.php b/includes/engine/class-tmdo-entity-health.php
index 0a466cc..e470ef7 100644
--- a/includes/engine/class-tmdo-entity-health.php
+++ b/includes/engine/class-tmdo-entity-health.php
@@ -14,6 +14,8 @@
  * @since   2.6.6
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions -- inherits engine coding standard.
 
 defined( 'ABSPATH' ) || exit;
diff --git a/includes/engine/class-tmdo-entity-migration-engine.php b/includes/engine/class-tmdo-entity-migration-engine.php
index c07c495..8d262be 100644
--- a/includes/engine/class-tmdo-entity-migration-engine.php
+++ b/includes/engine/class-tmdo-entity-migration-engine.php
@@ -14,6 +14,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-entity-registry.php b/includes/engine/class-tmdo-entity-registry.php
index 94496da..c4e0a5a 100644
--- a/includes/engine/class-tmdo-entity-registry.php
+++ b/includes/engine/class-tmdo-entity-registry.php
@@ -10,6 +10,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-hook-bus.php b/includes/engine/class-tmdo-hook-bus.php
index 0aaccca..6b25685 100644
--- a/includes/engine/class-tmdo-hook-bus.php
+++ b/includes/engine/class-tmdo-hook-bus.php
@@ -10,6 +10,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-mode-manager.php b/includes/engine/class-tmdo-mode-manager.php
index 7d315a8..4498141 100644
--- a/includes/engine/class-tmdo-mode-manager.php
+++ b/includes/engine/class-tmdo-mode-manager.php
@@ -31,6 +31,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-query-compiler.php b/includes/engine/class-tmdo-query-compiler.php
index 492f1ef..a5af880 100644
--- a/includes/engine/class-tmdo-query-compiler.php
+++ b/includes/engine/class-tmdo-query-compiler.php
@@ -10,6 +10,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-schema-manager.php b/includes/engine/class-tmdo-schema-manager.php
index 3b01057..9188165 100644
--- a/includes/engine/class-tmdo-schema-manager.php
+++ b/includes/engine/class-tmdo-schema-manager.php
@@ -11,6 +11,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-shadow-diff-logger.php b/includes/engine/class-tmdo-shadow-diff-logger.php
index 92b5fee..766b8fa 100644
--- a/includes/engine/class-tmdo-shadow-diff-logger.php
+++ b/includes/engine/class-tmdo-shadow-diff-logger.php
@@ -16,6 +16,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/engine/class-tmdo-type-caster.php b/includes/engine/class-tmdo-type-caster.php
index 9a1cf6e..f6d8bbe 100644
--- a/includes/engine/class-tmdo-type-caster.php
+++ b/includes/engine/class-tmdo-type-caster.php
@@ -11,6 +11,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/includes/export/class-tmdo-csv-writer.php b/includes/export/class-tmdo-csv-writer.php
index 912e2c0..271436d 100644
--- a/includes/export/class-tmdo-csv-writer.php
+++ b/includes/export/class-tmdo-csv-writer.php
@@ -9,6 +9,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/integrations/class-tmdo-demo-entity-counter.php b/includes/integrations/class-tmdo-demo-entity-counter.php
index 3270c80..d843900 100644
--- a/includes/integrations/class-tmdo-demo-entity-counter.php
+++ b/includes/integrations/class-tmdo-demo-entity-counter.php
@@ -20,6 +20,8 @@
  * @since   2.0.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/integrations/class-tmdo-member-fields.php b/includes/integrations/class-tmdo-member-fields.php
index 785a4df..7947554 100644
--- a/includes/integrations/class-tmdo-member-fields.php
+++ b/includes/integrations/class-tmdo-member-fields.php
@@ -8,6 +8,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/integrations/class-tmdo-points-manager.php b/includes/integrations/class-tmdo-points-manager.php
index d625378..5058595 100644
--- a/includes/integrations/class-tmdo-points-manager.php
+++ b/includes/integrations/class-tmdo-points-manager.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/integrations/class-tmdo-post-fields.php b/includes/integrations/class-tmdo-post-fields.php
index 6aead41..6f2685d 100644
--- a/includes/integrations/class-tmdo-post-fields.php
+++ b/includes/integrations/class-tmdo-post-fields.php
@@ -32,6 +32,8 @@
  * @since   2.9.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/integrations/class-tmdo-term-comment-garbage-filter.php b/includes/integrations/class-tmdo-term-comment-garbage-filter.php
index 859b0a6..75b2b52 100644
--- a/includes/integrations/class-tmdo-term-comment-garbage-filter.php
+++ b/includes/integrations/class-tmdo-term-comment-garbage-filter.php
@@ -37,6 +37,8 @@
  * @since   2.12.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/integrations/class-tmdo-term-comment-misc-bucket.php b/includes/integrations/class-tmdo-term-comment-misc-bucket.php
index c3116bc..7bc52bb 100644
--- a/includes/integrations/class-tmdo-term-comment-misc-bucket.php
+++ b/includes/integrations/class-tmdo-term-comment-misc-bucket.php
@@ -54,6 +54,8 @@
  * @since   2.12.4
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/interceptors/class-tmdo-interceptor-base.php b/includes/interceptors/class-tmdo-interceptor-base.php
index c8b5810..42f298b 100644
--- a/includes/interceptors/class-tmdo-interceptor-base.php
+++ b/includes/interceptors/class-tmdo-interceptor-base.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/interceptors/class-tmdo-standard-post-interceptor.php b/includes/interceptors/class-tmdo-standard-post-interceptor.php
index af21486..b91cb52 100644
--- a/includes/interceptors/class-tmdo-standard-post-interceptor.php
+++ b/includes/interceptors/class-tmdo-standard-post-interceptor.php
@@ -16,6 +16,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Table name from TMDO_DB::table(); column validated by subclass FIELD_MAP constant.
 
 if ( ! defined( 'ABSPATH' ) ) {
diff --git a/includes/interceptors/class-tmdo-sync-bridge.php b/includes/interceptors/class-tmdo-sync-bridge.php
index 49c8adb..a1b726b 100644
--- a/includes/interceptors/class-tmdo-sync-bridge.php
+++ b/includes/interceptors/class-tmdo-sync-bridge.php
@@ -5,6 +5,8 @@
  * @package TMDO
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/class-tmdo-archive-migration.php b/includes/migration/class-tmdo-archive-migration.php
index 0c68878..06df767 100644
--- a/includes/migration/class-tmdo-archive-migration.php
+++ b/includes/migration/class-tmdo-archive-migration.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/class-tmdo-cold-migration.php b/includes/migration/class-tmdo-cold-migration.php
index cdcddcb..058f9c7 100644
--- a/includes/migration/class-tmdo-cold-migration.php
+++ b/includes/migration/class-tmdo-cold-migration.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/class-tmdo-hot-migration.php b/includes/migration/class-tmdo-hot-migration.php
index 168cf20..c4c8321 100644
--- a/includes/migration/class-tmdo-hot-migration.php
+++ b/includes/migration/class-tmdo-hot-migration.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/class-tmdo-migration-base.php b/includes/migration/class-tmdo-migration-base.php
index 6b5c80e..51f5898 100644
--- a/includes/migration/class-tmdo-migration-base.php
+++ b/includes/migration/class-tmdo-migration-base.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/class-tmdo-migration-engine.php b/includes/migration/class-tmdo-migration-engine.php
index 8e91104..1174c0c 100644
--- a/includes/migration/class-tmdo-migration-engine.php
+++ b/includes/migration/class-tmdo-migration-engine.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/class-tmdo-migration-orchestrator.php b/includes/migration/class-tmdo-migration-orchestrator.php
index abfad1a..1ca4591 100644
--- a/includes/migration/class-tmdo-migration-orchestrator.php
+++ b/includes/migration/class-tmdo-migration-orchestrator.php
@@ -14,6 +14,8 @@
  * @since 2.8.0
  */
 
+declare(strict_types=1);
+
 // phpcs:ignore WPDO.AntiEAV -- platform migration tool: WPDO v1->v2 legacy meta orchestration
 
 if ( ! defined( 'ABSPATH' ) ) {
diff --git a/includes/migration/class-tmdo-migration-phase-base.php b/includes/migration/class-tmdo-migration-phase-base.php
index 9e07e1d..75af437 100644
--- a/includes/migration/class-tmdo-migration-phase-base.php
+++ b/includes/migration/class-tmdo-migration-phase-base.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting.FunctionComment,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.PHP.YodaConditions,WordPress.Security.EscapeOutput.OutputNotEscaped -- Internal helpers; SQL composed from registry-validated identifiers; exception messages not echoed.
 
 if ( ! defined( 'ABSPATH' ) ) {
diff --git a/includes/migration/class-tmdo-post-migration.php b/includes/migration/class-tmdo-post-migration.php
index a957de3..b29e414 100644
--- a/includes/migration/class-tmdo-post-migration.php
+++ b/includes/migration/class-tmdo-post-migration.php
@@ -1,4 +1,6 @@
 <?php
+
+declare(strict_types=1);
 // phpcs:ignore WPDO.AntiEAV -- platform migration tool: WPDO v1->v2 legacy post meta migration
 /**
  * TMDO_Post_Migration — Post entity migration core (v2.9.3).
diff --git a/includes/migration/class-tmdo-warm-migration.php b/includes/migration/class-tmdo-warm-migration.php
index ef3e100..d4c18e2 100644
--- a/includes/migration/class-tmdo-warm-migration.php
+++ b/includes/migration/class-tmdo-warm-migration.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/interface-migration-phase.php b/includes/migration/interface-migration-phase.php
index acb4aad..0265e59 100644
--- a/includes/migration/interface-migration-phase.php
+++ b/includes/migration/interface-migration-phase.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/phases/class-tmdo-phase-backfill-bulk.php b/includes/migration/phases/class-tmdo-phase-backfill-bulk.php
index 95e6cd9..9265067 100644
--- a/includes/migration/phases/class-tmdo-phase-backfill-bulk.php
+++ b/includes/migration/phases/class-tmdo-phase-backfill-bulk.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/phases/class-tmdo-phase-backfill-unserialize.php b/includes/migration/phases/class-tmdo-phase-backfill-unserialize.php
index c441294..fa6a38d 100644
--- a/includes/migration/phases/class-tmdo-phase-backfill-unserialize.php
+++ b/includes/migration/phases/class-tmdo-phase-backfill-unserialize.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-backup.php b/includes/migration/phases/class-tmdo-phase-backup.php
index d741783..17b3d09 100644
--- a/includes/migration/phases/class-tmdo-phase-backup.php
+++ b/includes/migration/phases/class-tmdo-phase-backup.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-cleanup.php b/includes/migration/phases/class-tmdo-phase-cleanup.php
index 6c6cb23..28b59e1 100644
--- a/includes/migration/phases/class-tmdo-phase-cleanup.php
+++ b/includes/migration/phases/class-tmdo-phase-cleanup.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-completed.php b/includes/migration/phases/class-tmdo-phase-completed.php
index 3ee9f8b..70e2f99 100644
--- a/includes/migration/phases/class-tmdo-phase-completed.php
+++ b/includes/migration/phases/class-tmdo-phase-completed.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/phases/class-tmdo-phase-demote.php b/includes/migration/phases/class-tmdo-phase-demote.php
index 7d35710..f931a79 100644
--- a/includes/migration/phases/class-tmdo-phase-demote.php
+++ b/includes/migration/phases/class-tmdo-phase-demote.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-diagnose.php b/includes/migration/phases/class-tmdo-phase-diagnose.php
index 819ffd6..a228df3 100644
--- a/includes/migration/phases/class-tmdo-phase-diagnose.php
+++ b/includes/migration/phases/class-tmdo-phase-diagnose.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/migration/phases/class-tmdo-phase-install-schema.php b/includes/migration/phases/class-tmdo-phase-install-schema.php
index 5016f48..93bb4ba 100644
--- a/includes/migration/phases/class-tmdo-phase-install-schema.php
+++ b/includes/migration/phases/class-tmdo-phase-install-schema.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-promote-aeav.php b/includes/migration/phases/class-tmdo-phase-promote-aeav.php
index faf0fca..43a514b 100644
--- a/includes/migration/phases/class-tmdo-phase-promote-aeav.php
+++ b/includes/migration/phases/class-tmdo-phase-promote-aeav.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-promote-shadow.php b/includes/migration/phases/class-tmdo-phase-promote-shadow.php
index 4569313..7667f10 100644
--- a/includes/migration/phases/class-tmdo-phase-promote-shadow.php
+++ b/includes/migration/phases/class-tmdo-phase-promote-shadow.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/migration/phases/class-tmdo-phase-verify-sample.php b/includes/migration/phases/class-tmdo-phase-verify-sample.php
index 19d90bf..0a42aa2 100644
--- a/includes/migration/phases/class-tmdo-phase-verify-sample.php
+++ b/includes/migration/phases/class-tmdo-phase-verify-sample.php
@@ -6,6 +6,8 @@
  * @since 3.0.1
  */
 
+declare(strict_types=1);
+
 
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
diff --git a/includes/notifications/abstract-class-tmdo-notifier.php b/includes/notifications/abstract-class-tmdo-notifier.php
index 48bd929..fcceff9 100644
--- a/includes/notifications/abstract-class-tmdo-notifier.php
+++ b/includes/notifications/abstract-class-tmdo-notifier.php
@@ -15,6 +15,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/notifications/class-tmdo-discord-notifier.php b/includes/notifications/class-tmdo-discord-notifier.php
index 3c6432a..c45add0 100644
--- a/includes/notifications/class-tmdo-discord-notifier.php
+++ b/includes/notifications/class-tmdo-discord-notifier.php
@@ -8,6 +8,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/notifications/class-tmdo-email-notifier.php b/includes/notifications/class-tmdo-email-notifier.php
index cfb333e..faa77a4 100644
--- a/includes/notifications/class-tmdo-email-notifier.php
+++ b/includes/notifications/class-tmdo-email-notifier.php
@@ -12,6 +12,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/notifications/class-tmdo-slack-notifier.php b/includes/notifications/class-tmdo-slack-notifier.php
index 9304af8..5ca6a5c 100644
--- a/includes/notifications/class-tmdo-slack-notifier.php
+++ b/includes/notifications/class-tmdo-slack-notifier.php
@@ -8,6 +8,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/notifications/class-tmdo-telegram-notifier.php b/includes/notifications/class-tmdo-telegram-notifier.php
index cfb9e80..176db8d 100644
--- a/includes/notifications/class-tmdo-telegram-notifier.php
+++ b/includes/notifications/class-tmdo-telegram-notifier.php
@@ -11,6 +11,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/query/class-tmdo-post-query-router.php b/includes/query/class-tmdo-post-query-router.php
index 4e9ccfb..6429769 100644
--- a/includes/query/class-tmdo-post-query-router.php
+++ b/includes/query/class-tmdo-post-query-router.php
@@ -27,6 +27,8 @@
  * @since   2.10.1
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/query/class-tmdo-query-interceptor-base.php b/includes/query/class-tmdo-query-interceptor-base.php
index d1d9aff..795798a 100644
--- a/includes/query/class-tmdo-query-interceptor-base.php
+++ b/includes/query/class-tmdo-query-interceptor-base.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/query/class-tmdo-query-router.php b/includes/query/class-tmdo-query-router.php
index 666f901..50e8566 100644
--- a/includes/query/class-tmdo-query-router.php
+++ b/includes/query/class-tmdo-query-router.php
@@ -5,6 +5,8 @@
  * @package TMDO
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/safety/class-tmdo-fsm-guard.php b/includes/safety/class-tmdo-fsm-guard.php
index 6e9e000..e52103d 100644
--- a/includes/safety/class-tmdo-fsm-guard.php
+++ b/includes/safety/class-tmdo-fsm-guard.php
@@ -13,6 +13,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/snapshots/class-tmdo-snapshot-manager.php b/includes/snapshots/class-tmdo-snapshot-manager.php
index 3daa377..0787204 100644
--- a/includes/snapshots/class-tmdo-snapshot-manager.php
+++ b/includes/snapshots/class-tmdo-snapshot-manager.php
@@ -10,6 +10,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/snapshots/class-tmdo-snapshot-pruner.php b/includes/snapshots/class-tmdo-snapshot-pruner.php
index da2f8a0..6f650f6 100644
--- a/includes/snapshots/class-tmdo-snapshot-pruner.php
+++ b/includes/snapshots/class-tmdo-snapshot-pruner.php
@@ -14,6 +14,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/snapshots/class-tmdo-snapshot-reader.php b/includes/snapshots/class-tmdo-snapshot-reader.php
index ec871f2..c1680f0 100644
--- a/includes/snapshots/class-tmdo-snapshot-reader.php
+++ b/includes/snapshots/class-tmdo-snapshot-reader.php
@@ -17,6 +17,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/snapshots/class-tmdo-snapshot-writer.php b/includes/snapshots/class-tmdo-snapshot-writer.php
index c7e6144..1478f9b 100644
--- a/includes/snapshots/class-tmdo-snapshot-writer.php
+++ b/includes/snapshots/class-tmdo-snapshot-writer.php
@@ -13,6 +13,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/trait-tmdo-anti-eav-aware.php b/includes/trait-tmdo-anti-eav-aware.php
index 3726499..5c41300 100644
--- a/includes/trait-tmdo-anti-eav-aware.php
+++ b/includes/trait-tmdo-anti-eav-aware.php
@@ -18,6 +18,8 @@
  * @since   2.17.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/zones/class-tmdo-zone-archive.php b/includes/zones/class-tmdo-zone-archive.php
index 4293a55..ccce528 100644
--- a/includes/zones/class-tmdo-zone-archive.php
+++ b/includes/zones/class-tmdo-zone-archive.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/zones/class-tmdo-zone-cold.php b/includes/zones/class-tmdo-zone-cold.php
index f26cda7..0fcdfa0 100644
--- a/includes/zones/class-tmdo-zone-cold.php
+++ b/includes/zones/class-tmdo-zone-cold.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/zones/class-tmdo-zone-hot.php b/includes/zones/class-tmdo-zone-hot.php
index 2657959..6b98460 100644
--- a/includes/zones/class-tmdo-zone-hot.php
+++ b/includes/zones/class-tmdo-zone-hot.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/zones/class-tmdo-zone-router.php b/includes/zones/class-tmdo-zone-router.php
index e778b5b..f941c60 100644
--- a/includes/zones/class-tmdo-zone-router.php
+++ b/includes/zones/class-tmdo-zone-router.php
@@ -11,6 +11,8 @@
  * @since 0.2.0
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/includes/zones/class-tmdo-zone-warm.php b/includes/zones/class-tmdo-zone-warm.php
index 7cbfbd8..43a0eeb 100644
--- a/includes/zones/class-tmdo-zone-warm.php
+++ b/includes/zones/class-tmdo-zone-warm.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/modules/options/class-tmdo-options-manager.php b/modules/options/class-tmdo-options-manager.php
index c00f9d6..a84ecb4 100644
--- a/modules/options/class-tmdo-options-manager.php
+++ b/modules/options/class-tmdo-options-manager.php
@@ -10,6 +10,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 // phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.
 
 
diff --git a/modules/options/index.php b/modules/options/index.php
index 7f3b1a3..9e2381b 100644
--- a/modules/options/index.php
+++ b/modules/options/index.php
@@ -5,6 +5,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
diff --git a/uninstall.php b/uninstall.php
index a572dfa..4fa1c0a 100644
--- a/uninstall.php
+++ b/uninstall.php
@@ -17,6 +17,8 @@
  * @package WP_Data_Optimizer
  */
 
+declare(strict_types=1);
+
 if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
 	exit;
 }