feat: Add project docs - PROJECT, ROADMAP, TASKS, TODO, .gitignore

TODO.md

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+# ESP32 Hacking TODO
+
+## Firmware Features
+- [ ] UDP command listener (reboot, identify, status, rate)
+- [ ] LED status indicator
+- [ ] OTA firmware updates
+- [ ] Adaptive sampling rate
+- [ ] BLE scanning
+- [ ] mDNS auto-discovery
+- [ ] On-device wander calculation
+- [ ] Chip temperature reporting
+- [ ] WiFi reconnect on disconnect
+- [ ] Configurable target IP/port via command
+
+## Tools
+- [ ] `esp-cmd` CLI tool to send commands to sensors
+- [ ] Flash script for OTA updates
+- [ ] Sensor discovery script (find all ESP32s on network)
+
+## Testing
+- [ ] Benchmark: CSI callback latency
+- [ ] Benchmark: UDP throughput at different rates
+- [ ] Test: WiFi reconnect reliability
+- [ ] Test: BLE + WiFi coexistence impact on CSI
+
+## Documentation
+- [ ] Pin mapping for ESP32-DevKitC V1
+- [ ] Memory usage analysis (heap, stack)
+- [ ] Power consumption measurements
+- [ ] Compare CSI quality: passive (router) vs active (ESP-NOW)
+
+## Ideas
+- ESP-NOW mesh for direct ESP32-to-ESP32 CSI
+- External PIR sensor for CSI ground truth validation
+- Battery + deep sleep mode for portable deployment
+- Web-based firmware configurator (WiFi credentials, UDP target)