fix: anchor Divi name/id patterns at string end, number-advanced stays unknown, doc wording

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/BlockTree/Block.php

@@ -20,7 +20,7 @@ use stdClass;
 final class Block extends Container
 {
     /** A valid block name: "namespace/block-name" (WordPress' own block name convention). */
-    private const NAME_PATTERN = '/^[a-z][a-z0-9_-]*\/[a-z][a-z0-9_-]*$/';
+    private const NAME_PATTERN = '/^[a-z][a-z0-9_-]*\/[a-z][a-z0-9_-]*$/D';
 
     /**
      * @param array<string, mixed> $attrs

src/Integrations/Divi/BlockTree/NodeIndex.php

@@ -14,7 +14,7 @@ namespace LIT\MCP\Integrations\Divi\BlockTree;
  */
 final class NodeIndex
 {
-    public const ID_PATTERN = '/^[srcmgx]\d+(\.[srcmgx]\d+)*$/';
+    public const ID_PATTERN = '/^[srcmgx]\d+(\.[srcmgx]\d+)*$/D';
 
     /** @var array<string, Block> */
     private array $byId = [];

src/Integrations/Divi/BlockTree/Serializer.php

@@ -9,7 +9,7 @@ namespace LIT\MCP\Integrations\Divi\BlockTree;
  * delimiters; changed or new blocks get delimiters generated exactly like WordPress'
  * get_comment_delimited_block_content() / serialize_block_attributes() do, which also
  * yields the escaping Divi expects inside $variable(…)$ payloads: json_encode()'s own
- * \" (an escaped quote inside a JSON string) is replaced by ", see ESCAPES below.
+ * \" (an escaped quote inside a JSON string) is replaced by \u0022, see ESCAPES below.
  */
 final class Serializer
 {