* chore: add gitcode release sync workflow
* fix(ci): address review feedback for gitcode sync workflow
- Use Authorization header instead of token in URL query parameter
- Add file existence check before copying signed Windows artifacts
- Remove inappropriate `|| true` from artifact listing
- Use heredoc for safe GITHUB_OUTPUT writing
- Add error context logging in upload_file function
- Add curl timeout for API requests (connect: 30s, max: 60s)
- Add cleanup step for temp files with `if: always()`
- Add env var validation for GitCode credentials
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
