feat(zastava): add evidence locker plan and schema examples

- Introduced README.md for Zastava Evidence Locker Plan detailing artifacts to sign and post-signing steps.
- Added example JSON schemas for observer events and webhook admissions.
- Updated implementor guidelines with checklist for CI linting, determinism, secrets management, and schema control.
- Created alert rules for Vuln Explorer to monitor API latency and projection errors.
- Developed analytics ingestion plan for Vuln Explorer, focusing on telemetry and PII guardrails.
- Implemented Grafana dashboard configuration for Vuln Explorer metrics visualization.
- Added expected projection SHA256 for vulnerability events.
- Created k6 load testing script for Vuln Explorer API.
- Added sample projection and replay event data for testing.
- Implemented ReplayInputsLock for deterministic replay inputs management.
- Developed tests for ReplayInputsLock to ensure stable hash computation.
- Created SurfaceManifestDeterminismVerifier to validate manifest determinism and integrity.
- Added unit tests for SurfaceManifestDeterminismVerifier to ensure correct functionality.
- Implemented Angular tests for VulnerabilityHttpClient and VulnerabilityDetailComponent to verify API interactions and UI rendering.

ops/devops/tenant/dashboards/tenant-audit.json

@@ -0,0 +1,11 @@
+{
+  "title": "Tenant Audit & Auth",
+  "timezone": "utc",
+  "panels": [
+    {"type": "timeseries", "title": "Tenant request latency p95", "targets": [{"expr": "histogram_quantile(0.95, rate(tenant_requests_duration_seconds_bucket[5m]))"}]},
+    {"type": "timeseries", "title": "Tenant error rate", "targets": [{"expr": "sum(rate(tenant_requests_total{status=~\"5..\"}[5m])) / sum(rate(tenant_requests_total[5m]))"}]},
+    {"type": "timeseries", "title": "JWKS cache hit rate", "targets": [{"expr": "rate(auth_jwks_cache_hits_total[5m]) / (rate(auth_jwks_cache_hits_total[5m]) + rate(auth_jwks_cache_misses_total[5m]))"}]},
+    {"type": "timeseries", "title": "Rate limit hits", "targets": [{"expr": "rate(tenant_rate_limit_hits_total[5m])"}]},
+    {"type": "timeseries", "title": "Tenant queue depth", "targets": [{"expr": "tenant_queue_depth"}]}
+  ]
+}