fix(2meet-data-optimizer): resync flat rows from native meta after each write

- dual_write / shadow_read no longer write flat in the update_/add_/
  delete_{type}_metadata pre-filters, before WP decides whether native
  changes at all. added_/updated_/deleted_{type}_meta (priority 1) call
  TMDO_Hook_Bus::sync_from_native(), which copies the entity's first native
  row (plain SQL, NULL when gone) into flat. Flat now follows native when WP
  skips (same value), refuses (non-matching prev_value, add $unique on an
  existing key) or deletes (also delete_all: touched IDs are collected from
  the meta IDs in delete_{type}_meta), and a flat value left stale by a
  direct SQL write heals on the next write.
- update_metadata_by_mid key changes: the old key is remembered in
  update_{type}_metadata_by_mid and re-synced too.
- wpdo_after_write / wpdo_after_delete fire from the sync with the same
  arguments; aeav_only keeps the pre-filter short-circuit unchanged.
- $internal_ops lock key includes the entity type (user 5 ≠ post 5).
- Live suite resync: 4 entities × 2 modes × 3 scenarios (old code: 16 of
  24 FAIL); integration: pre-filter leaves flat to the sync, delete_all
  re-syncs every touched user.
- Verify: live resync + shadow_write + serialized + zero_side_effect 33/33
  PASS; unit 687 OK, integration 485 OK, phpcs (phpcs.xml) 0, stan OK
- PR: PR-057

tests/live/README.md

@@ -38,6 +38,7 @@ Exit code 0 when every test passed, 1 otherwise. Output per test:
 |---|---|
 | `shadow_write` | writes in shadow_read reach native meta (user, term, HivePress listing) |
 | `serialized` | array meta values are stored serialized in flat tables, never "Array" |
+| `resync` | dual_write / shadow_read: flat follows native after every write (4 entities × 2 modes: update, same value, delete, refused writes, stale flat, key rename by meta_id) |
 | `zero_side_effect` | zone tables that were never created are never queried on save / delete |
 
 ## Tools (`tools/`)