chore: rename prefix automatically

[jvbriones]

---

Note

Automatically renames older Google Sheets tabs to drop the "pre-" prefix after processing, sorting tabs by version and returning extra metadata from processTab.

• CI Scripts (.github/scripts/post-merge-validation-tracker.mjs):
  • Add removePrePrefixFromSheet(...) to rename tabs by stripping pre-.
  • Update processTab to return { inserted, isNew, actualTitle }.
  • Enhance processRepo:
    • Sort tab groups by version (newest first).
    • After processing, rename all but the newest tab to remove pre-.

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