Bundle 900: align README repository visibility with GitHub

[nulleimy]

Purpose

Align the README visibility declaration with the actual GitHub repository state.

Exact change

• Repository visibility: PRIVATE -> Repository visibility: PUBLIC
• preserve the commercial proprietary / All Rights Reserved licensing language unchanged

Scope

Documentation-only metadata alignment. No source-code, license, runtime, release, deploy, repository-visibility setting, or production mutation.

Base

• canonical branch: feature/bundle-0-bootstrap
• exact base SHA: bc6fd0ab2fa88c21af3f2bddeb8df28b641b92bd

Governance

Merge remains separately authorized.