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

PROJECT.md

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+# ESP32 Hacking Project
+
+## Overview
+Firmware customization and experimentation for ESP32 CSI (Channel State Information) sensors used in the [wifi-sensing](~/git/wifi-sensing/) project.
+
+## Goals
+- Document current firmware and configuration
+- Add remote management commands (reboot, identify, status)
+- Implement OTA firmware updates
+- Explore BLE scanning for complementary presence detection
+- Optimize CSI data pipeline (adaptive rate, on-device processing)
+
+## Current State
+- 3x ESP32-DevKitC V1 deployed with stock `csi_recv_router` firmware
+- Firmware sends raw CSI data via UDP at ~100 pkt/s per device
+- No remote management capability (must physically access USB)
+
+## Hardware
+| Device | Chip | IP Address | Location |
+|--------|------|------------|----------|
+| muddy-storm | ESP32-WROOM-32 | 192.168.129.29 | Living Room |
+| amber-maple | ESP32-WROOM-32 | 192.168.129.30 | Office |
+| hollow-acorn | ESP32-WROOM-32 | 192.168.129.31 | Kitchen |
+
+## Software Stack
+| Component | Version | Purpose |
+|-----------|---------|---------|
+| ESP-IDF | v5.x | Development framework |
+| esp-csi | latest | CSI extraction library |
+| FreeRTOS | (bundled) | RTOS kernel |
+
+## Key Paths
+| Path | Description |
+|------|-------------|
+| `~/git/esp32-hacking/` | This project (firmware sources, docs) |
+| `~/git/wifi-sensing/` | Server application (receives CSI data) |
+| `~/esp/esp-idf/` | ESP-IDF toolchain |
+| `~/esp/esp-csi/` | Original esp-csi repo (build from here) |
+
+## Dependencies
+- ESP-IDF toolchain (`~/esp/esp-idf/`)
+- USB cable for initial flash (OTA planned)
+
+## References
+- [ESP-IDF Docs](https://docs.espressif.com/projects/esp-idf/en/latest/)
+- [ESP-CSI GitHub](https://github.com/espressif/esp-csi)
+- [ESP32 WiFi CSI API](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_wifi.html)