docs: publish a concise Bessemer interface

[Windsor Nguyễn (windsornguyen)]

Depends on #59.

What does this change?

This PR documents the public Bessemer interface.

• The README starts with the supported product contract and the init, build, and clean workflow.
• NOTICE and UPSTREAM_CHANGELOG.md contain Buck2 provenance.
• The MkDocs site documents the quick start, TypeScript, Rust, support status, configuration, and generated CLI reference.
• The site excludes inherited pages that have not been verified against the native Bessemer model.
• A typed Hollywood workflow builds documentation for trusted changes.
• The workflow deploys GitHub Pages only from main.

How was it tested?

• pnpm run ci check.

• python -m mkdocs build --strict -f mkdocs.yml.

• pnpm run ci check validates the generated workflow and its security policy.

• pnpm run ci check license validates repository license and provenance policy.

• CLA/Vouch check passes, or this PR only updates VOUCHED.td.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​pymdown-extensions@​11.0.1
	pypi/​mkdocs-material@​9.7.7
	pypi/​mkdocs@​1.6.1
	pypi/​mkdocs-llmstxt@​0.5.0
	pypi/​mkdocs-llmstxt-md@​0.3.0

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