docs: Add Sentry deployment documentation

- Create docs/sentry.md: Complete Sentry self-hosted deployment guide
  * Architecture overview with distributed system components
  * Core services: Relay, Kafka, Snuba, ClickHouse, PostgreSQL, Redis, SeaweedFS
  * Data flow and storage requirements
  * Management via slcompose orchestrator
  * Backup requirements documentation

- Update AI_CONTEXT.md: Add Sentry to core services
  * List Sentry as error tracking & observability platform
  * Add sentry.silveressence.net domain mapping

- Update README.md: Add Sentry to running services
  * Include in comprehensive services list

- Update roadmap.md: Mark Sentry as completed
  * Move from planned to completed section
  * Document all deployed components
  * List completed validation items
  * Reference deployment documentation

- Update services.md: Full Sentry service documentation
  * Add running Sentry service section
  * Document architecture, networking, and management
  * Remove from Phase 2 planned deployments
  * Link to detailed deployment guide

docs/roadmap.md

@@ -97,9 +97,32 @@ Purpose:
 Status:
 
 ```text
-Planned
+Completed
 ```
 
+Completed components:
+
+* Sentry self-hosted distributed deployment (70+ services)
+* Relay for event ingestion
+* Kafka for event streaming
+* ClickHouse for high-performance event storage
+* PostgreSQL for metadata storage
+* Snuba for event processing and query engine
+* Redis for caching and coordination
+* SeaweedFS for object/file storage
+* Web UI and API layer
+* Background workers (taskworker, cron, cleanup, etc.)
+* Nginx proxy integration at sentry.silveressence.net
+
+Deployment:
+
+* Docker Compose project: sentry-self-hosted
+* Management: slcompose orchestrator with Infisical secret injection
+* External access: sentry.silveressence.net (Nginx Proxy Manager)
+* Internal networking: Isolated sentry-self-hosted_default network
+
+See [docs/sentry.md](sentry.md) for complete deployment documentation.
+
 ---
 
 ### Identity And Access