docs: add shieldcn README badges

[0xdhrv]

Adds a compact shieldcn.dev badge row (stars + last commit) near the top of the README.

Supersedes #2 (renaming the head branch from cursor/... to bot/...).

  

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Summary by cubic

Adds shieldcn.dev badges to the README showing GitHub stars and last commit.

^{Written for commit f237e3c. Summary will update on new commits.}

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