- Add context parameter to shouldClearStickySession in tests
- Return 501 NotImplemented for TestCredentials
- Remove unused user variable in redeem_service
- Add comment for context.Background goroutine in promo_service
- Uncomment sora_client_handler tests (17 skipped tests)
- Add math/rand usage comment in request_transformer
- Fix ModelError.Error() to use fmt.Sprintf
- Add NotImplemented error type to errors package
- Optimize SSE defaultMaxLineSize from 500MB to 10MB
P0 fixes:
- ModelError.Is(): use exact matching instead of substring contains()
- shouldClearStickySession: add context param for cancellation/tracing
P1 fixes:
- TODO stubs: return 501 Not Implemented errors
- validateInstanceSignature: deduplicate to shared validateCodeSignature()
- Error messages: standardize to English only
- http.go: remove pseudo if-else with duplicate branches
