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/orchestrator/README.md

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+# StellaOps Source & Job Orchestrator
+
+The Orchestrator schedules, observes, and recovers ingestion and analysis jobs across the StellaOps platform.
+
+## Responsibilities
+- Track job state, throughput, and errors for Concelier, Excititor, Scheduler, and export pipelines.
+- Expose dashboards and APIs for throttling, replays, and failover.
+- Enforce rate-limits, concurrency and dependency chains across queues.
+- Stream structured events and audit logs for incident response.
+
+## Key components
+- Orchestrator WebService (control plane).
+- Queue adapters (Redis/NATS) and job ledger.
+- Console dashboard module and CLI integration for operators.
+
+## Integrations & dependencies
+- Authority for authN/Z on operational actions.
+- Telemetry stack for job metrics and alerts.
+- Scheduler/Concelier/Excititor workers for job lifecycle.
+- Offline Kit for state export/import during air-gap refreshes.
+
+## Operational notes
+- Job recovery runbooks and dashboard JSON as described in Epic 9.
+- Audit retention policies for job history.
+- Rate-limit reconfiguration guidelines.
+
+## Epic alignment
+- Epic 9: Source & Job Orchestrator Dashboard.
+- ORCH stories in ../../TASKS.md.