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Add CI, contributor essentials, and full T3/T4 demo coverage
kaymyg
- GitHub Actions CI: fmt check, clippy (-D warnings), build, test, release smoke test
- Dependabot for cargo + github-actions
- CONTRIBUTING.md, SECURITY.md, issue templates, PR template
- CHANGELOG.md
- Extend main.rs walkthrough to genuinely exercise T3/T4 elevation and D2/D3
capability issuance (was previously untested dead code, now real coverage)
- Document intentional clippy/dead_code allowances instead of suppressing
blindly
- README: CI/license/rust badges, live demo link, contributing/security/changelog sections
- Remove HF-only YAML frontmatter from the shared README (GitHub renders it
literally; license is now set via HF's dataset settings UI instead)
