docs: Clean up stale docs, add CHANGELOG

- Remove completed items from TODO.md (OSINT, fleet, collector done)
- Move TASKS.md sprint to v0.1.4, archive v0.1.3 as complete
- Create CHANGELOG.md covering v0.1.0 through v0.1.3

TODO.md

@@ -5,31 +5,23 @@
 - [ ] Pagination for all list endpoints
 - [ ] Filter by date range
 - [ ] Sort options
-- [ ] OpenAPI/Swagger spec generation
 - [ ] Rate limiting (flask-limiter)
 - [ ] API authentication (JWT or API keys)
+- [ ] Request logging middleware
 
 ## OSINT
 
-- [ ] IEEE OUI database download script
-- [ ] MAC vendor lookup on device creation
-- [ ] BLE company ID database
 - [ ] Device fingerprinting by advertisement patterns
 - [ ] SSID categorization (home, corporate, mobile hotspot)
 
 ## Collector
 
-- [ ] Heartbeat timeout (mark sensor offline)
 - [ ] CSI data storage (optional, high volume)
 - [ ] Data retention policy (auto-cleanup old records)
-- [ ] Metrics collection (packets/sec, errors)
 
 ## Fleet Management
 
-- [ ] Sensor config read/write
-- [ ] OTA orchestration
-- [ ] Calibration management
-- [ ] Bulk commands
+- [ ] Bulk commands (multi-sensor OTA/config)
 
 ## Deployment