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/process/implementor-guidelines.md

@@ -0,0 +1,32 @@
+# Implementor Guidelines (checklist draft)
+
+Reference: `docs/product-advisories/30-Nov-2025 - Implementor Guidelines for Stella Ops.md` (IG1–IG10) and Sprint 300 task IMPLEMENTOR-GAPS-300-018.
+
+## CI lint & docs linkage (IG7)
+- Require PRs to either touch referenced docs or set `docs: n/a` with justification.
+- Sample hook (to implement): `.git/hooks/pre-commit` invoking `scripts/lint-docs-touch.sh`.
+- Fail CI if sprint/AGENTS references are missing for the module being changed.
+
+## Determinism & offline posture (IG2, IG3)
+- Default to offline/no-network; flag any outbound calls in tests.
+- Set deterministic env vars (`TZ=UTC`, `LC_ALL=C`, `PYTHONHASHSEED=0`, etc.).
+- Enforce pinned tool/DB versions and stable ordering in outputs.
+
+## Secrets & provenance (IG5, IG9)
+- Run secret scan pre-commit/CI; forbid committing `.env`/keys.
+- DSSE/provenance required where predicates exist; verify signatures in CI when fixtures are present.
+
+## Schema/versioning control (IG1)
+- Any schema change requires version bump + changelog entry; add canonical serialization tests.
+- Store schemas alongside fixtures where practical.
+
+## Performance/quota (IG6)
+- Define perf budget per service (P95 latency/CPU/memory) and add smoke tests on reference profile.
+
+## Boundaries & shared libs (IG8)
+- Document allowed shared libraries per module; add codeowners/analyzer rules to block cross-boundary calls.
+
+## Evidence & documentation sync (IG10)
+- AGENTS files and sprint docs must link to this checklist; update both when rules change.
+
+> Replace this draft with full scripts and enforcement once IMPLEMENTOR-GAPS-300-018 is executed.