feat: add requirements and technical baseline

PLANS.md

@@ -78,17 +78,19 @@ the read-only project sources.
 - `MVP.md` contains the complete English product and acceptance specification.
 - `ARCHITECTURE.md` contains the English runtime, component, state-machine,
   protocol, memory, failure, and verification contracts.
-- `platformio.ini` resolves the environment `esp32-c6-mini` with
-  `espressif32@7.0.1`, ESP-IDF, explicit 4 MB build/upload size, `partitions.csv`,
-  LittleFS, and `sdkconfig.defaults`.
-- Running `/home/sasa/.platformio/penv/bin/pio project config` successfully
-  parsed and printed the canonical configuration. PlatformIO subsequently
-  emitted a sandbox-local telemetry cache permission warning during process
-  shutdown; it did not prevent configuration parsing.
-- Static partition arithmetic verified that the 2 MiB factory application ends
-  at `0x210000` and the 1,984 KiB LittleFS partition ends at `0x400000`.
-- `sdkconfig.defaults` contains `CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y` and
-  `CONFIG_LWIP_MAX_SOCKETS=16`.
+- On 2026-09-03, `/home/sasa/.platformio/penv/bin/pio project config` exited
+  successfully and resolved environment `esp32-c6-devkitm-1` with
+  `espressif32@7.0.1`, ESP-IDF, explicit 4 MB build/upload sizes,
+  `partitions.csv`, LittleFS, and `sdkconfig.defaults`. PlatformIO subsequently
+  emitted a telemetry-cache permission warning during process shutdown; it did
+  not prevent configuration parsing.
+- On 2026-09-03, an `awk` continuity and end-address check over
+  `partitions.csv` reported the factory partition ending at `0x210000`, the
+  LittleFS partition ending at `0x400000`, and no gaps or overlaps from NVS
+  through the end of Flash.
+- On 2026-09-03, `rg` confirmed
+  `CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y` and `CONFIG_LWIP_MAX_SOCKETS=16` in both
+  `sdkconfig.defaults` and the generated ESP-IDF configuration.
 - `docs/BOARD_PASSPORT.md` records the confirmed ESP32-C6FH4, 4 MB Flash,
   no-required-PSRAM baseline and the remaining explicit hardware unknowns.
 - Canonical files were created outside `sources/`; the reference files under
@@ -101,6 +103,12 @@ claim that firmware source code exists, that a firmware image builds, or that
 the target board has passed runtime tests. Those claims require evidence in
 later milestones.
 
+Milestone 001 was reopened on 2026-09-03 after its recorded evidence was found
+to disagree with the checked-in canonical files. The canonical `MVP.md`
+location, explicit Flash configuration, generated SDK configuration, and board
+passport were repaired and reverified before returning the milestone to
+`COMPLETE`. No Milestone 002 implementation work was started.
+
 ## Milestone 002 — Firmware skeleton and reproducible build
 
 **Status:** `NOT_STARTED`