B4 RAG Corpus Management UI + AGENTS.md → ai.md rename

- Backend: GET/DELETE/PATCH /api/rag/point/{id}, GET /api/rag/points
  (paginated, semantic search, source filter, sort)
- Frontend: admin-only RAG modal with stats bar, search, paginated table,
  per-row edit (re-embed) and delete, bulk flush with double confirm
- 14 new tests, 214 total passing
- AGENTS.md → ai.md (tool-agnostic), CLAUDE.md now references ai.md
- Bump v0.21.0 → v0.22.0

config.py

@@ -9,7 +9,7 @@ import logging
 
 log = logging.getLogger("caic")
 
-VERSION = "v0.21.0"
+VERSION = "v0.22.0"
 OLLAMA_BASE = os.environ.get("OLLAMA_BASE", "http://localhost:11434")
 LLAMA_SERVER_BASE = os.environ.get("LLAMA_SERVER_BASE", "http://192.168.50.108:8081")
 SEARXNG_BASE = os.environ.get("CAIC_SEARXNG_BASE", "http://localhost:8888")