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: c147fe275e

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[chatgpt-codex-connector]

Restore build for git-based installs

For consumers that install this package directly from a git ref, the install lifecycle relies on prepare to generate publish artifacts from source; after this change it only installs hooks. Since dist/ is gitignored and the package exports/types all point at dist/index.*, those git installs will complete without dist/index.js or dist/index.d.ts, causing imports and type resolution to fail even though the release workflow still builds before staged publishing.

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