docs: Complete v0.1 documentation sprint

- Add build & flash workflow (docs/INSTALL.md)
- Add CSI config reference and firmware comparison (docs/USAGE.md)
- Add quick reference cheatsheet (docs/CHEATSHEET.md)
- Add dependencies.lock to .gitignore (env-specific)
- Update TASKS.md with completed items and build notes
- Verified firmware builds on ESP-IDF v6.1.0 / aarch64

TASKS.md

@@ -9,14 +9,21 @@
 - [x] Document current firmware and settings
 
 ### P1 - Important
-- [ ] Document build & flash workflow step by step
-- [ ] Create .gitignore for build artifacts
-- [ ] Test building firmware from this repo
+- [x] Document build & flash workflow step by step
+- [x] Create .gitignore for build artifacts
+- [x] Test building firmware from this repo
 
 ### P2 - Normal
-- [ ] Document CSI config options (what each sdkconfig flag does)
-- [ ] Compare csi_recv vs csi_recv_router differences
+- [x] Document CSI config options (what each sdkconfig flag does)
+- [x] Compare csi_recv vs csi_recv_router differences
 
 ### P3 - Low
 - [ ] Document esp-crab dual-antenna capabilities
 - [ ] Document esp-radar console features
+
+## Notes
+
+- Build confirmed working on ESP-IDF v6.1.0 (aarch64/Pi 5)
+- Workaround needed: symlink `6.0` → `6.1` in `esp_csi_gain_ctrl` managed component
+- Branch renamed from `master` to `main`
+- Docs created: `docs/INSTALL.md`, `docs/USAGE.md`, `docs/CHEATSHEET.md`