Organize planning documents and update README structure

- Created a new `docs/planning/` directory to better organize architecture and implementation planning documents.
- Moved existing planning documents into the new directory for improved accessibility.
- Updated `README.md` to reflect the new document structure and added references to the organized planning documents.
- Enhanced overall documentation management for easier navigation and maintenance.

CHANGELOG.md

@@ -26,6 +26,19 @@ Each entry follows this format:
 
 ## [Unreleased]
 
+### Added
+- **Planning Documents Organization**: Organized architecture and implementation planning documents
+  - Created `docs/planning/` directory for all planning documents
+  - Moved `IGNY8-HOLISTIC-ARCHITECTURE-PLAN.md` to `docs/planning/`
+  - Moved `IGNY8-IMPLEMENTATION-PLAN.md` to `docs/planning/`
+  - Moved `Igny8-phase-2-plan.md` to `docs/planning/`
+  - Moved `CONTENT-WORKFLOW-DIAGRAM.md` to `docs/planning/`
+  - Moved `ARCHITECTURE_CONTEXT.md` to `docs/planning/`
+  - Moved `sample-usage-limits-credit-system` to `docs/planning/`
+  - Created `docs/refactor/` directory for refactoring plans
+  - Updated `README.md` to reflect new document structure
+  - **Impact**: Better organization of planning documents, easier to find and maintain
+
 ### Changed
 - **API Documentation Consolidation**: Consolidated all API documentation into single comprehensive reference
   - Created `docs/API-COMPLETE-REFERENCE.md` - Unified API documentation covering all endpoints, authentication, response formats, error handling, rate limiting, permissions, and integration examples