docs: trim SUBMIT_NOW to fit lablab.ai form limits

docs+pptx: refresh all submission deliverables to match shipping pipeline

fix: set SYSTEM=spaces so gradio skips its localhost-check on HF Docker

Switch to Qwen3-only stack: VLM=Qwen3-VL-32B, composer=Qwen3-8B

docs: pitch deck + demo video script + lablab submission form content

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

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

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

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

chore: drop Build-in-Public extra challenge

feat: SignBridge initial scaffold + tests