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/ledger.html

@@ -53,15 +53,15 @@
 
   <!-- Filters -->
   <div class="mc-filters">
-    <form method="get" action="/lightning/ledger" class="mc-filter-form">
-      <select name="tx_type" class="mc-select" onchange="this.form.submit()">
+    <form id="ledger-filter-form" class="mc-filter-form">
+      <select name="tx_type" class="mc-select" onchange="submitLedgerFilter()">
         <option value="">All Types</option>
         {% for t in tx_types %}
         <option value="{{ t }}" {% if filter_type == t %}selected{% endif %}>{{ t }}</option>
         {% endfor %}
       </select>
-      
-      <select name="status" class="mc-select" onchange="this.form.submit()">
+
+      <select name="status" class="mc-select" onchange="submitLedgerFilter()">
         <option value="">All Statuses</option>
         {% for s in tx_statuses %}
         <option value="{{ s }}" {% if filter_status == s %}selected{% endif %}>{{ s }}</option>
@@ -69,6 +69,18 @@
       </select>
     </form>
   </div>
+  <script>
+  function submitLedgerFilter() {
+    var form = document.getElementById('ledger-filter-form');
+    var params = new URLSearchParams();
+    var txType = form.querySelector('[name="tx_type"]').value;
+    var status = form.querySelector('[name="status"]').value;
+    if (txType) params.append('tx_type', txType);
+    if (status) params.append('status', status);
+    var qs = params.toString();
+    window.location.href = '/lightning/ledger' + (qs ? '?' + qs : '');
+  }
+  </script>
 
   <!-- Transactions Table -->
   <div class="mc-table-container">