fix: schema drifts, RLS policies, wiki plugin, agent_loop syntax, test imports, frontend error handling

- Migration 0135: Fix 3 VARCHAR length drifts + 2 missing tables (forgejo_reported_errors, pgp_keys)
- Migration 0136: Fix 8 RLS policies referencing app.tenant_id instead of app.current_tenant_id
- wiki/__init__.py: Import WikiPlugin for discover_builtins()
- wiki/plugin.py: Fix SyntaxError (unterminated triple-quoted string)
- agent_loop.py: Fix SyntaxError (stray n character in dict)
- test_p1_6_dms_streaming.py: Fix import (CHUNK_SIZE removed, use _sanitize_filename only)
- conftest.py: Use create_all only (alembic conflicts with create_all in tests)
- frontend errorTypes.ts: asError() now handles nested detail objects
- AGENTS.md: Sub-agents forbidden in this project
- DAMAGE_REPORT.md + SCHEMA_DRIFTS.md: Complete damage assessment
- scripts/schema_drift_check.py: Schema drift checker tool

Tests: 24/24 Phase J + 12/12 Phase K = 36/36 passed
tsc: 0 errors
Frontend build: successful

app/plugins/builtins/wiki/plugin.py

@@ -1,4 +1,4 @@
-"""Wiki plugin — knowledge articles, categories, versioning (H-WIKI, H-VER).""
+"""Wiki plugin - knowledge articles, categories, versioning."""
 from __future__ import annotations
 import logging
 from app.plugins.base import BasePlugin
@@ -6,6 +6,7 @@ from app.plugins.manifest import FrontendMenuItem, FrontendPageRoute, PluginMani
 
 logger = logging.getLogger(__name__)
 
+
 class WikiPlugin(BasePlugin):
     manifest = PluginManifest(
         name="wiki",
@@ -22,7 +23,6 @@ class WikiPlugin(BasePlugin):
     )
 
     async def on_activate(self, db, service_container, event_bus) -> None:
-        """Register wiki search provider on activation."""
         await super().on_activate(db, service_container, event_bus)
         try:
             from app.plugins.builtins.unified_search.provider_registry import get_search_registry
@@ -32,3 +32,8 @@ class WikiPlugin(BasePlugin):
             logger.info("Registered WikiSearchProvider")
         except Exception:
             logger.exception("Failed to register WikiSearchProvider")
+
+    async def on_deactivate(self, db, service_container, event_bus) -> None:
+        from app.core.hooks import unregister_actions_by_owner
+        unregister_actions_by_owner("wiki")
+        await super().on_deactivate(db, service_container, event_bus)