firmware_install docstring still describes version-only after_confirmed semantics

[millsmillsymills]

Follow-up from review of #114 (merged as #117).

#117 changed the after_confirmed gate in _reconnect_and_classify from version-only to (version, flavor) identity change, and updated that helper's docstring — but the public tool docstring was not updated. src/flipperzero_mcp/tools/firmware.py (flipperzero_firmware_install, Returns block) still says:

after_confirmed (True only if a post-reboot version change was observed; ...)

An agent reading the tool description will wrongly conclude a same-version fork swap reports after_confirmed=False. Update the Returns block to say the confirm fires on a post-reboot (version, flavor) identity change against a known baseline.

One-line docstring fix; no behavior change, no new tests needed.

🤖 Generated with Claude Code

[millsmillsymills]

This was generated by AI during triage.

Fixed in #120. Updated the flipperzero_firmware_install Returns block to describe after_confirmed as a post-reboot (version, flavor) identity change against a known baseline, matching the _reconnect_and_classify helper. Docstring-only, no behavior change.