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/dashboard/templates/base.html

@@ -26,6 +26,7 @@
 
     <!-- Desktop nav -->
     <div class="mc-header-right mc-desktop-nav">
+      <a href="/tasks" class="mc-test-link">TASKS</a>
       <a href="/briefing" class="mc-test-link">BRIEFING</a>
       <a href="/swarm/mission-control" class="mc-test-link">MISSION CONTROL</a>
       <a href="/swarm/live" class="mc-test-link">SWARM</a>
@@ -37,6 +38,7 @@
       <a href="/memory" class="mc-test-link">MEMORY</a>
       <a href="/router/status" class="mc-test-link">ROUTER</a>
       <a href="/self-modify/queue" class="mc-test-link">UPGRADES</a>
+      <a href="/work-orders/queue" class="mc-test-link">WORK ORDERS</a>
       <a href="/creative/ui" class="mc-test-link">CREATIVE</a>
       <a href="/mobile" class="mc-test-link" title="Mobile-optimized view">MOBILE</a>
       <button id="enable-notifications" class="mc-test-link" style="background:none;cursor:pointer;" title="Enable notifications">&#x1F514;</button>
@@ -57,6 +59,7 @@
       <span class="mc-time" id="clock-mobile"></span>
     </div>
     <a href="/" class="mc-mobile-link">HOME</a>
+    <a href="/tasks" class="mc-mobile-link">TASKS</a>
     <a href="/briefing" class="mc-mobile-link">BRIEFING</a>
     <a href="/swarm/live" class="mc-mobile-link">SWARM</a>
     <a href="/spark/ui" class="mc-mobile-link">SPARK</a>
@@ -65,6 +68,7 @@
     <a href="/swarm/events" class="mc-mobile-link">EVENTS</a>
     <a href="/lightning/ledger" class="mc-mobile-link">LEDGER</a>
     <a href="/memory" class="mc-mobile-link">MEMORY</a>
+    <a href="/work-orders/queue" class="mc-mobile-link">WORK ORDERS</a>
     <a href="/creative/ui" class="mc-mobile-link">CREATIVE</a>
     <a href="/voice/button" class="mc-mobile-link">VOICE</a>
     <a href="/mobile" class="mc-mobile-link">MOBILE</a>