feat: /admin/triage web UI + auto-drain loop

Makes human triage sustainable. Before: command-line-only review,
auto-triage stopped after 100 candidates/run. Now:

1. Web UI at /admin/triage
   - Lists all pending candidates with inline promote/reject/edit
   - Edit content in-place before promoting (PUT /memory/{id})
   - Change type via dropdown
   - Keyboard shortcuts: Y=promote, N=reject, E=edit, S=scroll-next
   - Cards fade out after action, queue count updates live
   - Zero JS framework — vanilla fetch + event delegation

2. auto_triage.py drains queue
   - Loops up to 20 batches (default) of 100 candidates each
   - Tracks seen IDs so needs_human items don't reprocess
   - Exits cleanly when queue empty
   - Nightly cron naturally drains everything

3. Dashboard + wiki surface triage queue
   - Dashboard /admin/dashboard: new "triage" section with pending
     count + /admin/triage URL + warning/notice severity levels
   - Wiki homepage: prominent callout "N candidates awaiting triage —
     review now" linking to /admin/triage, styled with triage-warning
     (>50) or triage-notice (>20) CSS

Pattern: human intervenes only when AI can't decide. The UI makes
that intervention fast (20 candidates in 60 seconds). Nightly
auto-triage drains the queue so the human queue stays bounded.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/atocore/api/routes.py

@@ -119,6 +119,17 @@ def wiki_search(q: str = "") -> HTMLResponse:
     return HTMLResponse(content=render_search(q))
 
 
+@router.get("/admin/triage", response_class=HTMLResponse)
+def admin_triage(limit: int = 100) -> HTMLResponse:
+    """Human triage UI for candidate memories.
+
+    Lists pending candidates with inline promote/reject/edit buttons.
+    Keyboard shortcuts: Y=promote, N=reject, E=edit content.
+    """
+    from atocore.engineering.triage_ui import render_triage_page
+    return HTMLResponse(content=render_triage_page(limit=limit))
+
+
 # --- Request/Response models ---
 
 
@@ -1022,6 +1033,16 @@ def api_dashboard() -> dict:
             except Exception:
                 pass
 
+    # Triage queue health
+    triage: dict = {
+        "pending": len(candidates),
+        "review_url": "/admin/triage",
+    }
+    if len(candidates) > 50:
+        triage["warning"] = f"High queue: {len(candidates)} candidates pending review."
+    elif len(candidates) > 20:
+        triage["notice"] = f"{len(candidates)} candidates awaiting triage."
+
     return {
         "memories": {
             "active": len(active),
@@ -1037,6 +1058,7 @@ def api_dashboard() -> dict:
         "interactions": interaction_stats,
         "extraction_pipeline": extract_state,
         "pipeline": pipeline,
+        "triage": triage,
     }