feat(docs): Add comprehensive documentation for Vexer, Vulnerability Explorer, and Zastava modules

- Introduced AGENTS.md, README.md, TASKS.md, and implementation_plan.md for Vexer, detailing mission, responsibilities, key components, and operational notes.
- Established similar documentation structure for Vulnerability Explorer and Zastava modules, including their respective workflows, integrations, and observability notes.
- Created risk scoring profiles documentation outlining the core workflow, factor model, governance, and deliverables.
- Ensured all modules adhere to the Aggregation-Only Contract and maintain determinism and provenance in outputs.

docs/modules/devops/README.md

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+# StellaOps DevOps
+
+The DevOps module captures release, deployment, and migration playbooks that keep StellaOps deterministic across environments.
+
+## Responsibilities
+- Maintain CI pipelines, signing workflows, and release packaging steps.
+- Operate shared runbooks for launch readiness, upgrades, and NuGet previews.
+- Provide offline kit assembly instructions and tooling integration.
+- Wrap observability/telemetry bootstrap flows for platform teams.
+
+## Key components
+- Runbooks under ./runbooks/ (launch, deployment, nuget).
+- Migration guidance under ./migrations/.
+- Architecture overview bridging CI/CD & infrastructure concerns.
+
+## Integrations & dependencies
+- Ops pipelines (Gitea, GitHub Actions) and artifact registries.
+- Authority/Signer for supply chain signing.
+- Telemetry stack bootstrap scripts.
+
+## Operational notes
+- Offline bundle packaging guidance in docs/modules/export-center/operations/runbook.md.
+- Dashboards for launch cutover rehearsals.
+- Coordination with Security for enforced guardrails.
+
+## Related resources
+- ./runbooks/launch-readiness.md
+- ./runbooks/launch-cutover.md
+- ./runbooks/deployment-upgrade.md
+- ./runbooks/nuget-preview-bootstrap.md
+- ./migrations/semver-style.md
+
+## Backlog references
+- DEVOPS-LAUNCH-18-001 / 18-900 runbooks in ../../TASKS.md.
+- Telemetry bootstrap automation tracked in `ops/devops/TASKS.md`.
+
+## Epic alignment
+- **Epic 1 – AOC enforcement:** bake AOC verifier steps, CI guards, and schema validation into pipelines.
+- **Epic 9 – Orchestrator Dashboard:** support operational dashboards, job recovery runbooks, and rate-limit governance.
+- **Epic 10 – Export Center:** manage signing workflows, Offline Kit packaging, and release promotion for exports.
+- **Epic 15 – Observability & Forensics:** coordinate telemetry deployment, evidence retention, and forensic automation.