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/kit/README.md

@@ -10,3 +10,8 @@ Contents to include when built:
 Deterministic packaging: `tar --mtime @0 --owner 0 --group 0 --numeric-owner -cf - kit | zstd -19 --long=27 --no-progress > zastava-kit.tzst`.
 
 Pending: fill with signed artefacts and Evidence Locker URIs after DSSE signing.
+Planned Evidence Locker paths (post-signing):
+- `evidence-locker/zastava/2025-12-06/observer_event.schema.dsse`
+- `evidence-locker/zastava/2025-12-06/webhook_admission.schema.dsse`
+- `evidence-locker/zastava/2025-12-06/thresholds.dsse`
+- `evidence-locker/zastava/2025-12-06/zastava-kit.tzst` + `SHA256SUMS`