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/notify/README.md

@@ -0,0 +1,35 @@
+# StellaOps Notify
+
+Notify evaluates operator-defined rules against platform events and dispatches channel-specific payloads with full auditability.
+
+## Responsibilities
+- Process event streams and apply tenant-scoped routing rules.
+- Render connector-specific payloads (email, Slack, Teams, webhook, custom).
+- Enforce throttling, digests, and delivery retries.
+- Surface delivery/audit data for UI and CLI consumers.
+
+## Key components
+- `StellaOps.Notify.WebService` (rules API + preview).
+- `StellaOps.Notify.Worker` (delivery engine).
+- Connector libraries under `StellaOps.Notify.Connectors.*`.
+
+## Integrations & dependencies
+- MongoDB for rule/channel storage.
+- Redis/NATS for delivery queues.
+- CLI/UI for authoring and monitoring notifications.
+
+## Operational notes
+- Schema fixtures in ./resources/schemas & ./resources/samples.
+- Connector-specific monitoring dashboards.
+- Offline runner guidance inside operations playbook.
+
+## Related resources
+- ./resources/schemas
+- ./resources/samples
+
+## Backlog references
+- NOTIFY-SVC-38..40 (Notify backlog) referenced in `docs/README.md`.
+- DOCS-NOTIFY updates tracked in ../../TASKS.md when available.
+
+## Epic alignment
+- **Epic 11 – Notifications Studio:** deliver notifications workspace, preview tooling, immutable delivery ledger, and tenant-scoped throttling/digest controls.