fix(backend): scope conversation and feedback access to the authenticated user#25
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…ated user Forward the caller's Cognito sub from the proxy's validated JWT claims to the backend and tag every stored message with owner_sub. Reject reads or writes to a session owned by a different user. Feedback update_item calls now require the target row to already exist and belong to the caller, preventing both row upserts and cross-user tampering.
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Forward the caller's Cognito sub from the proxy's validated JWT claims to the backend and tag every stored message with owner_sub. Reject reads or writes to a session owned by a different user. Feedback update_item calls now require the target row to already exist and belong to the caller, preventing both row upserts and cross-user tampering.