Adds the 'is the device running the right firmware, and flash it if not'
layer on top of the flasher.
- _firmware.py: FirmwarePin (pinned to the firmware/ submodule commit) and
matches() — a device version-string test against the pinned git SHA (or a
release tag, once tagged releases exist).
- FirmwareInfo gains expected_firmware + matches_pin, computed on connect, so
pm3.firmware.matches_pin tells you whether the fork build is present.
- pm3flash console-script: auto-detect, compare to the pin, resolve the image
(--image / $PM3PY_FIRMWARE / local build), confirm, flash with progress,
then reopen and verify the new version. Flashes only on mismatch unless
--force; fullimage-only unless --allow-bootrom.
Detection + CLI are unit-tested; the auto-download layer (fetch the pinned
release asset) and hardware validation are still to come. Suite 1034 pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
