Slice 6: notifications per §15

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/bot.py

@@ -25,7 +25,7 @@ from __future__ import annotations
 import json
 from dataclasses import dataclass
 
-from . import db
+from . import db, notify
 from .gitea import Gitea
 
 
@@ -89,6 +89,18 @@ def _log(
             json.dumps(details) if details else None,
         ),
     )
+    # §15 chokepoint per §19.1 brief: fan-out runs inline after the
+    # audit row lands. notify.py owns the routing rules and the
+    # auto-watch upsert per §15.6; the call is intentionally a
+    # single line here so the chokepoint is one place to read.
+    notify.fan_out_from_action(
+        actor_user_id=actor.user_id,
+        action_kind=action_kind,
+        rfc_slug=rfc_slug,
+        branch_name=branch_name,
+        pr_number=pr_number,
+        details=details,
+    )
 
 
 class Bot: