docs: add Phylax Credible Layer developer docs - #1373

Bugbot Analysis Progress (1m 9s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (1m 7s)
✅ Posted analysis results (1s)

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

Request ID: serverGenReqId_dce0eab4-6ac4-4bff-a24e-a1e5eba078be