docs(readme): tighten Why AMD + add For Deaf-led teams section

docs(walkthrough): Deaf-community ethics + MI300X comparison + future work

fix: threading.Lock on LandmarkExtractor + composer prompt format match

feat(ui): Record-sign tab — multi-frame burst capture for full ASL words

feat(backend): /recognize accepts frames list + body-size cap

feat(vlm): add recognize_sign_from_frames for multi-image VLM input

feat(prompts): NVIDIA-pattern single-frame + multi-frame VLM prompts

perf: cache OpenAI-compatible client per (provider, model) tuple

refactor: extract closed vocabulary into signbridge.vocab module

fix: 4 BLOCKERs + 6 IMPORTANTs from deep-check audit

docs(rules): add 'research before decisions' + 'deep-check before checkpoints' to standing rules

feat(submission): generate 1280x640 cover image for HF Space + lablab

fix: clean up stale Apache 2.0 mentions + restore walkthrough spacing

fix(submission): move HF Space to event org lablab-ai-amd-developer-hackathon

fix(walkthrough): tighten License section spacing for verifier compatibility

fix(license): switch from Apache 2.0 to MIT to satisfy hackathon rule

docs: snapshot competition requirements as authoritative section in CLAUDE.md

fix: composite alpha onto white before VLM round-trip

feat: end-to-end smoke test + gold-set accuracy harness

docs: fill in GitHub + HF Space URLs in CLAUDE.md

fix: shorten README short_description to <60 chars (HF Space requirement)

chore: drop Build-in-Public extra challenge

feat: SignBridge initial scaffold + tests