feat(hh): /pw command, RAM-only direnv autostart, robust lets-hack; coven→clergy

- add /pw (alias /password): reveal this room's password locally (never
  broadcast); surfaced in the F1 help overlay and the join hint
- direnv-autostart/: cd-to-launch a single real-user session via direnv;
  password is minted in memory at launch (never written to disk, matching the
  RAM-only model) and scoped to the child process. setup.sh installs direnv,
  hooks bash/zsh, and `direnv allow`s the dir
- lets-hack.sh: boot a FRESH server by default (replacing any live one) with a
  --reuse opt-out; add -h/--help/-help; guard against killing the tmux session
  you're attached to; switch-client into the coven when run inside tmux
- rename coven→clergy across rust/python/scripts; tests/test_coven.py→test_clergy.py
- snapshots in-progress hack-house client work (sandbox, themes, net, ui)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cmd_chat/server/views.py

@@ -16,7 +16,7 @@ def generate_ws_token(user_id: str, secret: bytes) -> str:
 
 
 def _roster_frame(app: Sanic) -> str:
-    """Authoritative presence snapshot — all coven members converge on this."""
+    """Authoritative presence snapshot — all clergy members converge on this."""
     users = app.ctx.session_store.get_all()
     return json.dumps(
         {
@@ -46,7 +46,7 @@ async def srp_init(request: Request, app: Sanic) -> HTTPResponse:
             return response.json({"error": "Username taken"}, status=409)
 
         if app.ctx.session_store.count() >= app.ctx.max_users:
-            return response.json({"error": "Coven full"}, status=409)
+            return response.json({"error": "Clergy full"}, status=409)
 
         user_id, B, salt = app.ctx.srp_manager.init_auth(username, client_public)
 
@@ -82,7 +82,7 @@ async def srp_verify(request: Request, app: Sanic) -> HTTPResponse:
         # Authoritative capacity gate — the slot is only consumed once a session
         # is actually added here (init is best-effort / racy).
         if app.ctx.session_store.count() >= app.ctx.max_users:
-            return response.json({"error": "Coven full"}, status=409)
+            return response.json({"error": "Clergy full"}, status=409)
 
         H_AMK, session_key = app.ctx.srp_manager.verify_auth(user_id, client_proof)
 
@@ -173,7 +173,7 @@ async def chat_ws(request: Request, ws: Websocket, app: Sanic) -> None:
         pass
     finally:
         await manager.disconnect(user_id)
-        # Free the slot + username so the coven can be rejoined (was previously
+        # Free the slot + username so the clergy can be rejoined (was previously
         # held until the 1h stale sweep, which also blocked the name).
         app.ctx.session_store.remove(user_id)
         await manager.broadcast(