feat(ownership): Phase 9 — Ownership & Daily Operations [FASE-9]

Backend:
- TechniqueOwnership model: per-technique owner, backup owner, team
- RevalidationQueueItem model: prioritised analyst work queue
  (critical/high/medium/low, reasons: validation_expired/infra_change/
   osint_alert/mitre_update/rule_modified/low_confidence/manual)
- Migration b035ownerq: creates technique_ownerships and
  revalidation_queue_items tables with full indexes

Services:
- ownership_service: set/get technique ownership, bulk assign by tactic
  or platform, orphan reports for techniques and assets
- revalidation_queue_service: smart queue generation (scans expired
  validations, low-confidence techniques, recent infra changes),
  list/create/update queue items, analyst dashboard

Router /api/v1/ownership:
  GET/PUT /ownership/techniques/{id}   — technique ownership
  PATCH   /ownership/assets/{id}       — asset ownership
  GET     /ownership/orphans/techniques — orphan report
  GET     /ownership/orphans/assets     — orphan report
  POST    /ownership/bulk-assign        — bulk by tactic/platform
  GET/POST /ownership/queue             — revalidation queue CRUD
  PATCH   /ownership/queue/{id}         — update item status/assignee
  POST    /ownership/queue/generate     — scan & generate items
  GET     /ownership/analyst-dashboard  — personalised daily view

Scheduler: queue_generation job daily at 02:30 (after decay engine)

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

backend/app/jobs/mitre_sync_job.py

@@ -209,6 +209,20 @@ def _run_decay_engine() -> None:
         db.close()
 
 
+def _run_queue_generation() -> None:
+    """Generate revalidation queue items for analysts — runs after decay engine."""
+    logger.info("Scheduled revalidation queue generation starting...")
+    db = SessionLocal()
+    try:
+        from app.services.revalidation_queue_service import generate_queue_items
+        results = generate_queue_items(db)
+        logger.info("Queue generation finished — %s", results)
+    except Exception:
+        logger.exception("Queue generation job failed")
+    finally:
+        db.close()
+
+
 # ---------------------------------------------------------------------------
 # Scheduler bootstrap
 # ---------------------------------------------------------------------------
@@ -315,6 +329,15 @@ def start_scheduler() -> None:
         name="Detection decay engine (daily 02:00)",
         replace_existing=True,
     )
+    scheduler.add_job(
+        _run_queue_generation,
+        trigger="cron",
+        hour=2,
+        minute=30,
+        id="queue_generation",
+        name="Revalidation queue generation (daily 02:30)",
+        replace_existing=True,
+    )
     scheduler.start()
     logger.info(
         "Background scheduler started — mitre_sync (24h), intel_scan (7d), "