v0.2.1

feat: Use OtaImageState for boot partition state

- get-boot: print OTA state name (NEW/VALID/etc.) instead of enum repr
- set-boot: stamp manually-selected slot as VALID so it survives
  CONFIG_BOOTLOADER_APP_ROLLBACK_EN firmware (default NEW would be
  flipped to PENDING_VERIFY and rolled back on next boot)

v0.2.0

docs: Improve README

v0.1.0

build: Add metadata, requires-python, and pin dependencies