docs: record Phase 1 hardware bring-up status and deferred items

docs/build-guide-phase1-notes.md

@@ -1,5 +1,22 @@
 # Phase 1 Build Notes
 
+## Status (2026-07-11)
+
+Firmware flashed and running on physical hardware. Boot log confirms:
+- I2C bus scan found all 3 expected devices: `0x24` (CH422G), `0x5D` (GT911), `0x76` (BME280)
+- Display shows "Thermostat — Phase 1 OK" as expected
+- GT911 touch attached with hardware interrupt (touch confirmed responsive via Waveshare's factory demo firmware; not yet confirmed under our own firmware/HA)
+- BME280 sensor entities registered, no I2C errors
+- WiFi connects cleanly, device reachable at `firecrest.local`
+- Climate entity built with heat/cool modes and home/away presets, zero boot errors
+- Fixed one real bug found during bring-up: ESPHome defaults ESP32-S3 logger to `USB_SERIAL_JTAG`, a different physical USB port than this board's UART-flashing port — logs were silently going nowhere until `hardware_uart: UART0` was set explicitly
+
+**Deferred / not yet verified (blocked on physical access to hardware):**
+- [ ] Relay bench test with multimeter — user doesn't have relays on hand, will test at office on a breadboard. GPIO wiring assumed correct for now based on clean compile + boot; not electrically verified.
+- [ ] Full Home Assistant pairing — `ha_api_key` in `secrets.yaml` is currently a placeholder (valid format, not a real key). Touch, sensor, switch, and climate entities not yet confirmed visible/controllable in HA itself.
+
+Proceeding to Phase 2 (LVGL interface design) with the above two items still open — revisit before calling Phase 1 fully signed off.
+
 Source: Waveshare Wiki, fetched 2026-07-11.
 - https://www.waveshare.com/wiki/ESP32-S3-Touch-LCD-7B (confirmed this is the "Type B" product page — distinct from the non-B `ESP32-S3-Touch-LCD-7` page, same pinout on both as of this writing)
 - Schematic PDF: https://files.waveshare.com/wiki/ESP32-S3-Touch-LCD-7/ESP32-S3-Touch-LCD-7-Sch.pdf