fix(2meet-data-optimizer): route a meta query only when every registered clause is routable

- Leave the query to WordPress on OR, nested groups with registered keys, several post types, orderby on a named routed clause, and compare/type pairs whose flat-column semantics differ from native (untyped numeric ranges, CHAR on decimals, NUMERIC on text)
- Wrap LIKE values as %esc_like%; hook pre_get_posts at priority 1000 so plugin clauses (HivePress) are seen
- Verify: wp eval-file tests/live/run.php router (7/7); qbench Q04/Q06/Q08/Q14/Q16 == native on dev36
- PR: PR-060

tests/integration/PostQueryRouterCopyTest.php

@@ -65,7 +65,7 @@ class PostQueryRouterCopyTest extends TestCase {
 			array(
 				'post_type'   => 'rc_item',
 				'post_status' => 'publish',
-				'meta_query'  => array( array( 'key' => 'rc_price', 'value' => array( 5, 20 ), 'compare' => 'BETWEEN' ) ),
+				'meta_query'  => array( array( 'key' => 'rc_price', 'value' => array( 5, 20 ), 'compare' => 'BETWEEN', 'type' => 'NUMERIC' ) ),
 			),
 			$vars
 		) as $k => $v ) {