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/ai/agent_loop.py

@@ -423,7 +423,7 @@ async def run_react_loop(
                                             {
                                                 "block_type": "approval_request",
                                                 "block_data": {
-n                                                    "title": f"Approval: {tool_name}",
+                                                    "title": f"Approval: {tool_name}",
                                                     "description": f"Agent wants to execute tool '{tool_name}' with arguments: {json.dumps(args)[:300]}",
                                                     "approval_id": str(approval.id),
                                                     "status": "pending",