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/ci/README.md

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+# StellaOps CI Recipes
+
+CI module collects reproducible pipeline recipes for builds, tests, and release promotion across supported platforms.
+
+## Responsibilities
+- Provide ready-to-use pipeline snippets for ingestion, scanning, policy evaluation, and exports.
+- Document required secrets/scopes and deterministic build knobs.
+- Highlight offline-compatible workflows and cache strategies.
+
+## Key components
+- Recipe catalogue in ./recipes.md.
+
+## Integrations & dependencies
+- DevOps release workflows.
+- Module-specific test suites referenced in recipes.
+
+## Operational notes
+- Encourage reuse through templated YAML/JSON fragments.
+
+## Related resources
+- ./recipes.md
+
+## Backlog references
+- CI recipes refresh tracked in ../../TASKS.md under DOCS-CI stories.
+
+## Epic alignment
+- **Epic 1 – AOC enforcement:** bake ingestion/verifier guardrails into CI recipes.
+- **Epic 10 – Export Center:** provide pipeline snippets for export packaging, signing, and Offline Kit publication.
+- **Epic 11 – Notifications Studio:** offer CI hooks for notification previews/tests where relevant.