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.

docs/modules/zastava/SHA256SUMS

@@ -3,3 +3,5 @@ f466bf2b399f065558867eaf3c961cff8803f4a1506bae5539c9ce62e9ab005d  schemas/webhoo
 40fabd4d7bc75c35ae063b2e931e79838c79b447528440456f5f4846951ff59d  thresholds.yaml
 652fce7d7b622ae762c8fb65a1e592bec14b124c3273312f93a63d2c29a2b989  kit/verify.sh
 f3f84fbe780115608268a91a5203d2d3ada50b4317e7641d88430a692e61e1f4  kit/README.md
+2411a16a68c98c8fdd402e19b9c29400b469c0054d0b6067541ee343988b85e0  schemas/examples/observer_event.example.json
+4ab47977b0717c8bdb39c52f52880742785cbcf0b5ba73d9ecc835155d445dc1  schemas/examples/webhook_admission.example.json