- parses the spritec _WxH_CxR naming convention incl. auto-detection of
integer-upscaled sheets (256x64 named 8x8_4x1 -> 64x64 cells)
- tight alpha bbox per frame with threshold/shrink/pad tuning, row-major
indices, empty-frame flags; boxes relative to frame origin
- show command draws frames + box outline in the terminal for verification
- go tests: scanning, threshold, shrink/pad clamping, name parsing,
scale inference, JSON roundtrip
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmdG9GqfSWCzts7AkDwRDh
