feat(telemetry): Record chunk latency, result count, and source count in AdvisoryAiTelemetry
fix(endpoint): Include telemetry source count in advisory chunks endpoint response
test(metrics): Enhance WebServiceEndpointsTests to validate new metrics for chunk latency, results, and sources
refactor(tests): Update test utilities for Deno language analyzer tests
chore(tests): Add performance tests for AdvisoryGuardrail with scenarios and blocked phrases
docs: Archive Sprint 137 design document for scanner and surface enhancements
b059bc7675