feat: add task queue with human-in-the-loop approval + work orders + UI bug fixes

Task Queue system:
- New /tasks page with three-column layout (Pending/Active/Completed)
- Full CRUD API at /api/tasks with approve/veto/modify/pause/cancel/retry
- SQLite persistence in task_queue table
- WebSocket live updates via ws_manager
- Create task modal with agent assignment and priority
- Auto-approve rules for low-risk tasks
- HTMX polling for real-time column updates
- HOME TASK buttons now link to task queue with agent pre-selected
- MARKET HIRE buttons link to task queue with agent pre-selected

Work Order system:
- External submission API for agents/users (POST /work-orders/submit)
- Risk scoring and configurable auto-execution thresholds
- Dashboard at /work-orders/queue with approve/reject/execute flow
- Integration with swarm task system for execution

UI & Dashboard bug fixes:
- EVENTS: add startup event so page is never empty
- LEDGER: fix empty filter params in URL
- MISSION CONTROL: LLM backend and model now read from /health
- MISSION CONTROL: agent count fallback to /swarm/agents
- SWARM: HTMX fallback loads initial data if WebSocket is slow
- MEMORY: add edit/delete buttons for personal facts
- UPGRADES: add empty state guidance with links
- BRIEFING: add regenerate button and POST /briefing/regenerate endpoint

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

src/config.py

@@ -84,6 +84,12 @@ class Settings(BaseSettings):
     self_modify_allowed_dirs: str = "src,tests"
     self_modify_backend: str = "auto"  # "ollama", "anthropic", or "auto"
 
+    # ── Work Orders ──────────────────────────────────────────────────
+    # External users and agents can submit work orders for improvements.
+    work_orders_enabled: bool = True
+    work_orders_auto_execute: bool = False  # Master switch for auto-execution
+    work_orders_auto_threshold: str = "low"  # Max priority that auto-executes: "low" | "medium" | "high" | "none"
+
     model_config = SettingsConfigDict(
         env_file=".env",
         env_file_encoding="utf-8",