* fix(ci): update publish workflow to use bun install
pnpm-lock.yaml was removed in the bun migration but publish.yml
still referenced it. Use bun for install/build, keep pnpm for
publish (publishConfig overrides + --provenance).
* docs: update stale pnpm references to bun across docs and scripts
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>