feat: v0.1.3 — fleet management endpoints

- GET /sensors/<hostname>/config: query sensor STATUS, parse response
- PUT /sensors/<hostname>/config: update rate, power, adaptive, etc.
- POST /sensors/<hostname>/ota: trigger OTA update with URL
- POST /sensors/<hostname>/calibrate: trigger baseline calibration

Added 14 new tests for fleet management endpoints.

ROADMAP.md

@@ -24,12 +24,12 @@
 - [x] Device profile enrichment
 - [x] Export endpoints (CSV, JSON)
 
-## v0.1.3 - Fleet Management
+## v0.1.3 - Fleet Management [DONE]
 
-- [ ] Sensor config endpoint (GET/PUT)
-- [ ] OTA trigger endpoint
-- [ ] Calibration trigger endpoint
-- [ ] Sensor history/metrics
+- [x] Sensor config endpoint (GET/PUT)
+- [x] OTA trigger endpoint
+- [x] Calibration trigger endpoint
+- [ ] Sensor history/metrics (moved to v0.1.4)
 
 ## v0.1.4 - Zones & Presence