chore: build before stage publish

[chenjiahan]

Summary

• Build packages in the release workflow before pnpm stage publish.
• Remove duplicate build commands from scripts.prepare where present.

Validation

• Verified staged publish workflows have a preceding pnpm build.
• Ran git diff --check.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore the build before CI tests

Removing prepare means the CI install step no longer runs rslib, and the checked .github/workflows/ci.yml still goes from pnpm install --frozen-lockfile to lint and then pnpm test without any build step. The tests execute bin.js, which imports ./dist/index.js, but dist/ is not tracked in a fresh checkout, so every CI test job will fail with the missing dist module unless prepare is kept or CI/test builds first.

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