feat(persistence): PostgreSQL assistant store, chat persist fixes, gateway scripts

- Add SQLAlchemy Core repos, pg adapter/compat, assistant_store factory, Alembic bootstrap and migration/cutover scripts.

- Harden chat_message writes (NUL scrub for PG), turn_uuid on attempt failure, WS turn_runner fallbacks and gateway executed_turn_uuid init.

- start_gateway: log paths, PS7 stderr handling via cmd, background stdout/stderr redirect; runtime assistant_runtime_log_dir export.

- Ops: clear_all_chat_sessions with PG-only --postgresql and env-gated wipe; clear_postgres_chat_sessions.ps1.

- Tests: SA repos, pg compat, persist fallback, smoke env isolation; CI and docs touch-ups.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/workers/wiki/main.py

@@ -13,6 +13,7 @@ from typing import Any
 
 from svc.config.paths import PROJECT_ROOT, db_path
 from svc.persistence.sqlite_store import OclawTask, SqliteStore
+from svc.persistence.assistant_store import get_assistant_store
 
 
 def _load_oclaw_config() -> dict[str, Any]:
@@ -312,7 +313,7 @@ def _process_task(*, task: OclawTask, handlers: dict[str, Any], plugin_cfg: dict
 def run_worker() -> int:
     interval_s = max(2, min(int(os.getenv("AIA_WIKI_WORKER_POLL_SECONDS", "4")), 60))
     worker_id = str(os.getenv("AIA_WIKI_WORKER_ID") or "wiki-worker-main").strip() or "wiki-worker-main"
-    store = SqliteStore(db_path())
+    store = get_assistant_store()
     while True:
         cfg = _load_oclaw_config()
         plugin_cfg = _wiki_plugin_config(cfg)