Add validation for gha-find-replace actions

[adamtheturtle]

Summary

• Add validation for gha-find-replace actions
• Fail the workflow if no files are modified during file updates
• This prevents silent failures in the release process

🤖 Generated with Claude Code

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Note

Add validation to the release workflow to fail if the changelog update modifies no files.

• CI (release workflow) in .github/workflows/release.yml:
  • Add id: update_changelog to the changelog update step for output access.
  • New validation step to fail the workflow if gha-find-replace modifies 0 files (ensuring changelog actually updates).

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