feat: v0.1.4 — device intelligence dashboard

Add tabbed dashboard at /dashboard/ with three D3.js visualizations:
- Vendor treemap (devices grouped by type and vendor)
- SSID social graph (force-directed, shared probed SSIDs as edges)
- Fingerprint clusters (packed circles by device behavior)

Intelligence API endpoints at /api/v1/intelligence/ with param
validation. Dashboard built on htmx + Pico CSS dark theme + D3 v7,
all vendored locally (make vendor). 13 new tests (59 total).

TASKS.md

@@ -1,8 +1,8 @@
 # ESP32-Web Tasks
 
-**Last Updated:** 2026-02-05
+**Last Updated:** 2026-02-06
 
-## Current Sprint: v0.1.4 — Zones & Presence
+## Current Sprint: v0.1.5 — Zones & Presence
 
 ### P1 - High
 - [ ] Zone model (name, description, location)
@@ -16,9 +16,20 @@
 - [ ] Dwell time analysis
 - [ ] Presence history endpoint
 
-### P3 - Low (carried from v0.1.3)
-- [ ] Add pagination to all list endpoints
-- [ ] Add request logging middleware
+### P2 - Dashboard (v0.2.0)
+- [ ] Presence timeline (Gantt chart, low effort)
+- [ ] Deauth attack timeline (alert overlay, low effort)
+
+## Completed: v0.1.4 — Device Intelligence Dashboard
+
+- [x] Base dashboard layout (htmx + Pico CSS + D3.js dark theme)
+- [x] Vendor treemap visualization (`/api/v1/intelligence/vendor-treemap`)
+- [x] SSID social graph visualization (`/api/v1/intelligence/ssid-graph`)
+- [x] Fingerprint clusters visualization (`/api/v1/intelligence/fingerprint-clusters`)
+- [x] Jinja2 base template with tab navigation
+- [x] Vendored static assets: Pico CSS, htmx, D3.js v7 (`make vendor`)
+- [x] Dashboard + intelligence API tests (13 new tests, 59 total)
+- [x] Pagination totals, request logging, data retention CLI
 
 ## Completed: v0.1.3 — Fleet Management
 
@@ -63,3 +74,4 @@
 - API listens on TCP 5500
 - Commands sent to sensors on UDP 5501
 - SQLite for dev, PostgreSQL for prod
+- Dashboard at `/dashboard/` with htmx tab switching