docs: Add production CRUD validation to changelog

Tested full CRUD cycle via MCP in production:
- list_collections, create_document, update_document, delete_document
- All operations successful with SSH tunnel on port 5433

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -13,6 +13,14 @@ All notable changes to this project will be documented in this file.
 
 ### Validated
 
+- **Production Testing (2026-01-31):** Full CRUD cycle validated via MCP
+  - `list_collections` - 2 collections listed ✅
+  - `create_document` - Document created and published ✅
+  - `update_document` - Text updated, version incremented ✅
+  - `delete_document` - Permanently deleted ✅
+  - SSH tunnel active on port 5433
+  - 164 tools available and functional
+
 - **Code Review Session:** All 6 bug fixes confirmed in source code
   - INSERT statements verified with correct columns
   - ID generation logic validated (gen_random_uuid, urlId generation)