improvement(copilot): make copilot_messages the sole transcript store, remove JSONB dual-write #4826

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_63dfe7ab-4494-4972-b2e7-5c20078b7a7a

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 32daf69. Configure here.}