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

Adds a validation step to the release workflow to fail if the changelog find-replace makes no modifications.

• CI · Release workflow (.github/workflows/release.yml)
  • Assigns id: update_changelog to the gha-find-replace changelog step.
  • Adds a validation step to exit with error if modifiedFiles from update_changelog is 0.

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