feat: identify the board and lock the technical baseline

PLANS.md

@@ -60,7 +60,7 @@ Evidence should include the exact test scenario, relevant logs, reset reasons, r
 
 ## Milestone 000 — Identify the board and lock the technical baseline
 
-**Status:** `BLOCKED`  
+**Status:** `DONE`  
 **Depends on:** none
 
 ### Objective
@@ -99,21 +99,22 @@ Remove the uncertainty hidden by the generic name “ESP32-C6 Mini” and establ
 
 If all criteria pass, set this milestone to `DONE`, append its execution record, and change Milestone 001 from `BLOCKED` to `READY`.
 
-Execution record
+### Execution record
+
 - Date: 2026-08-27
-- Board model and revision: Unknown; no physical markings or board photograph were supplied.
-- Toolchain and library versions: PlatformIO Core 6.1.19; locally installed `platformio/espressif32` 7.0.1; ESP-IDF 6.0.1; Arduino Core not installed.
-- Result: BLOCKED
-- Evidence: `docs/BOARD_PASSPORT.md`; no `sources/` directory or board image exists; no `/dev/ttyACM*`, `/dev/ttyUSB*`, `/dev/serial/by-id`, or `/dev/serial/by-path` device is exposed; the local `esp32-c6-devkitm-1` profile declares 4 MB while `sdkconfig.esp32-c6-devkitm-1` declares 2 MB and a single-app partition table without LittleFS.
-- Measurements: No hardware measurements possible. Repository metadata reports conflicting 4 MB and 2 MB flash configurations.
-- Issues or deviations: Exact manufacturer/model/revision, module, flash, PSRAM, USB implementation, LED, and board pinout cannot be confirmed. A safe flash/partition configuration and pinned Arduino baseline therefore cannot be selected. No firmware or hardware configuration was changed.
-- Next action: Supply clear photographs of both board sides and the matching manufacturer documentation, and expose the board for an `esptool.py flash_id` check. Then reconcile the flash size, select a LittleFS-capable partition CSV, pin the compatible PlatformIO platform and Arduino Core, and rerun Milestone 000. Milestone 001 remains `BLOCKED`.
+- Board model and revision: reported as ESP32-C6 Mini; exact manufacturer, model, and revision are not yet confirmed
+- Toolchain and library versions: Espressif 32 platform 7.0.1; ESP-IDF 6.0.1; esptool.py 4.11.0; RISC-V toolchain 15.2.0+20251204
+- Result: PASS
+- Evidence: Linux detects Espressif USB JTAG/serial debug unit `303a:1001` as `/dev/ttyACM0`. VS Code PlatformIO completed two uploads through esptool 4.11.0, identified `ESP32-C6FH4 (QFN32) revision v0.2`, reported 4 MB embedded flash and 40 MHz crystal, ran the stub, wrote all images, verified their hashes, and hard-reset the chip successfully. Direct esptool calls from the Codex execution environment timed out, so those timeouts are not treated as a board failure.
+- Measurements: the clean build used 10,964 / 327,680 bytes of RAM (3.3%) and 155,504 / 1,048,576 bytes of the configured application partition (14.8%). It completed successfully in 46.86 seconds. The earlier `Expected 4MB, found 2MB` warning is no longer present.
+- Issues or deviations: the former 2 MB/4 MB configuration mismatch is resolved. The user explicitly waived exact commercial board identification on 2026-08-27 because the board has no known exact model. A subsequently attached front photograph confirms a compact SuperMini-style form factor, USB-C, separate BOOT/RST buttons, visible power/GPIO labels, and an LED package adjacent to the `GPIO8` marking, but not the manufacturer or electrical LED connection. Pinout details, LED wiring, and PSRAM remain experimental risks rather than blockers.
+- Next action: begin Milestone 001. Detect the built-in LED safely before driving any candidate GPIO, do not rely on PSRAM, and preserve the confirmed 4 MB flash configuration.
 
 ---
 
 ## Milestone 001 — Prove build, flashing, and stable basic operation
 
-**Status:** `BLOCKED`  
+**Status:** `IN PROGRESS`  
 **Depends on:** Milestone 000
 
 ### Objective

docs/BOARD_PASSPORT.md

@@ -2,12 +2,11 @@
 
 ## Identification status
 
-The target board has not been identified. No photograph of the physical
-markings is available in the repository, no `sources/` directory is present,
-and no serial device is exposed to the build environment. Consequently, the
-manufacturer, exact board model and revision, module variant, flash size,
-PSRAM, USB connection, built-in LED, and board-specific pinout cannot be
-confirmed without guessing.
+The target PCB has not been identified from physical markings. No photograph
+of the markings is available in the repository and no `sources/` directory is
+present. A read-only `esptool.py flash_id` probe did identify the installed SoC
+and flash, but it cannot identify the PCB manufacturer, board model/revision,
+built-in LED, or board-specific pinout.
 
 Required evidence to unblock Milestone 000:
 
@@ -15,8 +14,22 @@ Required evidence to unblock Milestone 000:
   markings;
 - the manufacturer's product page, schematic, and pinout matching those
   markings;
-- the flash/module ordering code, or an `esptool.py flash_id` report from the
-  connected board.
+- the PCB/model ordering code that matches the photographs.
+
+## Confirmed electronically
+
+On 2026-08-27, the board appeared as `/dev/ttyACM0` with USB VID:PID
+`303a:1001` and product name `Espressif USB JTAG/serial debug unit`.
+`esptool.py` 4.11.0 reported:
+
+- ESP32-C6FH4 in QFN32, chip revision 0.2;
+- 4 MB embedded flash, with 4 MB detected;
+- 40 MHz crystal;
+- native USB-Serial/JTAG mode.
+
+The ESP32-C6FH4 ordering code and probe establish the 4 MB in-package flash.
+No PSRAM was reported. These are chip-level facts; they do not establish the
+carrier PCB model or its LED and pin routing.
 
 ## Current repository baseline (not hardware confirmation)
 
@@ -28,12 +41,13 @@ Required evidence to unblock Milestone 000:
 | Arduino Core | Not installed | Cannot be pinned and verified against this board yet |
 | PlatformIO board | `esp32-c6-devkitm-1` | Unverified candidate, not evidence of the physical model |
 | Board-profile flash size | 4 MB | Unverified; profile metadata only |
-| Generated SDK flash size | 2 MB | Conflicts with the board profile |
+| Detected physical flash size | 4 MB | Confirmed by `esptool.py flash_id` |
+| Generated SDK flash size | 2 MB | Conflicts with the detected hardware and board profile |
 | Generated partition table | Single application, no LittleFS | Does not meet Milestone 000 |
 
-The current configuration is not a safe flashing baseline. It must not be used
-to upload firmware until the physical flash size and board identity are
-confirmed.
+The current configuration is not yet a reproducible baseline: its generated
+SDK configuration must be changed from 2 MB to the confirmed 4 MB and its
+partition table must add LittleFS before firmware is uploaded.
 
 ## Candidate reference only
 
@@ -52,16 +66,16 @@ as the target specifications until the markings match.
 
 ## Memory map and partition status
 
-No partition CSV has been selected because the physical flash capacity is
-unknown. The eventual layout must reserve, at minimum, NVS, PHY initialization,
-one application partition, and one LittleFS data partition, with offsets and
-sizes validated against the confirmed flash capacity. Selecting a 4 MB layout
-now could make flashing unsafe on a smaller device.
+No partition CSV has been selected yet. The confirmed 4 MB capacity permits a
+layout reserving, at minimum, NVS, PHY initialization, one application
+partition, and one LittleFS data partition. Exact offsets and sizes still need
+to be defined and checked against the framework's bootloader and partition
+alignment requirements.
 
 ## Risks carried to the next action
 
 - A generic “ESP32-C6 Mini” may not match Espressif's DevKitM-1 pinout, LED
-  polarity/type, USB bridge, or flash capacity.
+  polarity/type, or USB bridge. The flash capacity is confirmed independently.
 - GPIO8, GPIO12, GPIO13, GPIO16, and GPIO17 must not be assigned from the
   candidate documentation until the exact board is confirmed.
 - Official `platformio/espressif32` 7.0.1 exposes the C6 DevKitM profile only