James L 5c153e56dc flash.py: Auto-download from GitHub with cache, add --release/--offline flags ...

Default behavior now checks GitHub for the latest release and downloads
firmware if the cache is empty or outdated. Cached binaries are stored
in .firmware_cache/{board}/ with SHA-256 integrity verification.

New flags:
  --release TAG  Flash a specific release version
  --offline      Skip online check, use cached/local firmware only

Removed --download flag (downloading is now the default).
Added .firmware_cache/ and rnodethv3_firmware.bin to .gitignore.

2026-02-28 15:00:40 -05:00

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