Add enterprise docs structure and include pending core maintenance updates.

docs/features/change-data-capture.md

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+# Change Data Capture
+
+## Purpose And Business Outcome
+
+Expose transactional change events so consumers can react to committed inserts, updates, and deletes.
+
+## Scope And Non-Goals
+
+Scope:
+- Collection-level change stream subscriptions
+- Event publication after successful commit
+
+Non-goals:
+- Cross-process event transport guarantees
+- External message broker delivery semantics
+
+## User And System Workflows
+
+1. Consumer subscribes to a collection change stream.
+2. Application performs data mutations.
+3. On commit, CDC publishes events to active subscribers.
+4. Subscriber handlers process entity and metadata payloads.
+
+## Interfaces And APIs
+
+- `Watch(...)` collection API
+- `ChangeStreamObservable`
+- `ChangeStreamDispatcher`
+- `ChangeStreamEvent`
+
+## Permissions And Data Handling
+
+- CDC payloads can include document identifiers and entity data.
+- Restrict subscription access to trusted application components.
+
+## Dependencies And Failure Modes
+
+Dependencies:
+- Transaction commit lifecycle
+- Subscriber channel health
+
+Failure modes:
+- Subscriber backpressure or handler exceptions
+- Event handling assumptions that conflict with rollback behavior
+
+## Monitoring, Alerts, And Troubleshooting
+
+- Review CDC behavior in integration and scalability tests.
+- Follow [`../runbook.md`](../runbook.md) for incident response.
+- Follow [`../security.md`](../security.md) for event payload handling controls.
+- Use [`../troubleshooting.md`](../troubleshooting.md) for diagnosis guidance.
+
+## Rollout And Change Considerations
+
+- Behavioral CDC changes require explicit release-note callouts.
+- Maintain compatibility expectations for event payload shape.
+
+## Validation Guidance
+
+- Run `CdcTests` and `CdcScalabilityTests` before release.
+- Validate commit-only emission behavior in regression tests.