fix(release): pass base to title sync files

[matthew-dean]

Summary

• pass the release base branch to release-metadata.js sync-files in the release-title sync job
• add regression assertions that the workflow calls sync-files with <base> <version> <previousVersion>

Why

The auto-created alpha release PR in #4503 failed because the title-sync job called sync-files with only version and previous version, causing 5.0.0-alpha.1 to be interpreted as the release base.

Verification

• node scripts/test-release-automation.js
• git diff --check

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[greptile-apps]

Greptile Summary

This PR fixes release-title synchronization by passing the pull request’s base branch as the first sync-files argument and adds regression assertions for the corrected workflow invocation.

• Exposes the pull request base as RELEASE_BASE in the title-sync step.
• Passes base, version, and previous version to release-metadata.js sync-files.
• Verifies the workflow wiring in the release automation tests.

Confidence Score: 5/5

The PR appears safe to merge, with no actionable defects identified in the corrected workflow invocation or its regression assertions.

The title-sync job is restricted to pull requests targeting master or alpha, and the updated call now matches the release metadata command’s expected base, version, and previous-version argument contract.

_{Reviews (1): Last reviewed commit: "fix(release): pass base to title sync fi..." | Re-trigger Greptile}