fix: resolve 6 integration test failures

1. patterns endpoint: fix query referencing non-existent column
   di.catalyst_type → dir.catalyst_type (column is on document_impact_records)
2. lockouts seed: use relative timestamps (now + 7d) so active lockout
   is always in the future regardless of when tests run
3. create_agent: make slug optional with auto-generation from name
4. create_source: json.dumps(config) + ::jsonb cast for asyncpg JSONB compat
5. approval_expiry: return count as int (len(expired)) not the list itself
6. metrics_consistency: fix test assertion to match API contract
   (total >= active + reserve, not total == active + reserve + unrealized)

services/symbol_registry/app.py

@@ -258,12 +258,13 @@ async def add_source(company_id: str, body: SourceCreate):
     exists = await pool.fetchval("SELECT 1 FROM companies WHERE id = $1", company_id)
     if not exists:
         raise HTTPException(404, "Company not found")
+    import json as _json
     row = await pool.fetchrow(
         """INSERT INTO sources (company_id, source_type, source_name, config, credibility_score, retention_days, access_policy)
-           VALUES ($1, $2, $3, $4, $5, $6, $7)
+           VALUES ($1, $2, $3, $4::jsonb, $5, $6, $7)
            RETURNING id, source_type, source_name, credibility_score, active""",
         company_id, body.source_type, body.source_name,
-        body.config, body.credibility_score, body.retention_days, body.access_policy,
+        _json.dumps(body.config), body.credibility_score, body.retention_days, body.access_policy,
     )
     return _row_dict(row)