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/swarm_live.html

@@ -440,5 +440,17 @@ function addLog(message, type) {
 }
 
 connect();
+
+// HTMX fallback: load initial data via REST if WebSocket is slow
+setTimeout(function() {
+    if (document.getElementById('stat-agents').textContent === '-') {
+        refreshStats();
+        fetch('/swarm/agents').then(function(r) { return r.json(); }).then(function(data) {
+            if (data.agents && data.agents.length > 0) {
+                updateAgentsList(data.agents);
+            }
+        }).catch(function() {});
+    }
+}, 2000);
 </script>
 {% endblock %}