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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Reviewed commit: 14d49bc8c4

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[chatgpt-codex-connector]

Keep building during package preparation

With rslib removed from prepare, a clean checkout that is packed or published outside this one GitHub workflow (for example pnpm pack, a manual pnpm publish, or a consumer installing this repo as a git dependency) no longer generates dist, while this package only publishes files: ["dist"] and all exports point into ./dist/.... The new workflow build covers pnpm stage publish only; the package-manager lifecycle still runs prepare before packing/publishing per the npm lifecycle docs, so these other supported paths now produce/install a package with missing entry points.

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