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.
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# StellaOps Policy Engine
Policy Engine compiles and evaluates Stella DSL policies deterministically, producing explainable findings with full provenance.
## Responsibilities
- Compile `stella-dsl@1` packs into executable graphs.
- Join advisories, VEX evidence, and SBOM inventories to derive effective findings.
- Expose simulation and diff APIs for UI/CLI workflows.
- Emit change-stream driven events for Notify/Scheduler integrations.
## Key components
- `StellaOps.Policy.Engine` service host.
- Shared libraries under `StellaOps.Policy.*` for evaluation, storage, DSL tooling.
## Integrations & dependencies
- MongoDB findings collections, RustFS explain bundles.
- Scheduler for incremental re-evaluation triggers.
- CLI/UI for policy authoring and runs.
## Operational notes
- DSL grammar and lifecycle docs in ../../policy/.
- Observability guidance in ../../observability/policy.md.
- Governance and scope mapping in ../../security/policy-governance.md.
## Backlog references
- DOCS-POLICY-20-001 … DOCS-POLICY-20-012 (completed baseline).
- DOCS-POLICY-23-007 (upcoming command updates).
## Epic alignment
- **Epic 2 Policy Engine & Editor:** deliver deterministic evaluation, DSL infrastructure, explain traces, and incremental runs.
- **Epic 4 Policy Studio:** integrate registry workflows, simulation at scale, approvals, and promotion semantics.