v0.1.0

Fix CI: locate ESPHome build dir under boards/<board>/.esphome

The compile step succeeds for all three boards, but "Collect binaries"
looked for firmware.factory.bin at .esphome/build/<b>/... (repo root).
ESPHome writes build output next to the board YAML, so the real path is
boards/<b>/.esphome/build/<b>/.pioenvs/<b>/. Locate it with find so the
step is robust to layout changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XpCz2RvuxV5uV8bFwCEpkL