Add Anthropic prompt-cache hint and cache-hit metrics #1403

Bugbot Review

Bugbot Analysis Progress (7m 7s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (6m 57s)
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Final Result: Bugbot completed review and found 2 potential issues.

Request ID: serverGenReqId_36c3a5af-e6ad-494d-87c9-c4a6351c10e3

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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