Add comprehensive documentation for Linear Void project

- Created README.md in docs folder outlining project structure and documentation links.
- Added SECURITY.md detailing the security model, threat model, authentication, transport security, network isolation, and incident response procedures.
- Introduced SETUP.md providing a detailed setup guide for local and production environments, including prerequisites, environment setup, and Gitea integration.
- Added STREAMING.md outlining the streaming pipeline, including production flow, source-media contract, playout and HLS packaging, cache contract, player behavior, and monitoring.
- Updated architecture documentation to include links to new SETUP.md and STREAMING.md files for better navigation.

README.md

@@ -206,11 +206,11 @@ Contributions, issues, and further evolution (LL-HLS, ABR, multi-channel, E2EE)
 
 - [CHANGELOG.md](CHANGELOG.md) - Version history and completed features.
 - [CONTRIBUTING.md](CONTRIBUTING.md) - Guidelines for contributing to the project.
-- [SETUP.md](SETUP.md) - Complete setup guide with prerequisites, environment configuration, running the application, and troubleshooting.
+- [SETUP.md](docs/SETUP.md) - Complete setup guide with prerequisites, environment configuration, running the application, and troubleshooting.
-- [API.md](API.md) - Implemented WebSocket and REST API reference.
+- [API.md](docs/API.md) - Implemented WebSocket and REST API reference.
-- [DEPLOYMENT.md](DEPLOYMENT.md) - Production deployment and operations guide.
+- [DEPLOYMENT.md](docs/DEPLOYMENT.md) - Production deployment and operations guide.
-- [MONITORING.md](MONITORING.md) - Prometheus and Grafana setup and troubleshooting.
+- [MONITORING.md](docs/MONITORING.md) - Prometheus and Grafana setup and troubleshooting.
-- [SECURITY.md](SECURITY.md) - Security controls, hardening checklist, and incident baseline.
+- [SECURITY.md](docs/SECURITY.md) - Security controls, hardening checklist, and incident baseline.
 - [Scaling Playbook](docs/operations/scaling-performance-playbook.md) - Performance test method, thresholds, and scaling decision flow.
 - [Architecture Documentation](docs/architecture/README.md) - Full arc42 template with diagrams and decisions.
 - [ADRs](docs/architecture/adr/) - Detailed decision records (ADR-001 to ADR-007).
@@ -232,4 +232,4 @@ Since this is a linear project, we also rely on a linear development and release
 
 [MIT License](LICENSE)
 
-The project is ready for use. See [`SETUP.md`](SETUP.md) for detailed installation instructions.
+The project is ready for use. See [`SETUP.md`](docs/SETUP.md) for detailed installation instructions.

docs/DEPLOYMENT.md

@@ -135,7 +135,7 @@ See .env.example and SETUP.md for full variable reference.
 
 ## Pull-and-Run Deployment
 
-Images are built and pushed automatically by the CI and release workflows (see [CONTRIBUTING.md](CONTRIBUTING.md#versioning-and-releases) for the release procedure).
+Images are built and pushed automatically by the CI and release workflows (see [CONTRIBUTING.md](../CONTRIBUTING.md#versioning-and-releases) for the release procedure).
 
 Every push to `main` triggers CI (builds `:main` and `:latest` tags) and CD (deploys `:latest` to test lab) in parallel. Semantic version tags (`*.*.*`, e.g. `1.0.9`) trigger the release workflow which builds `:X.Y.Z`, `:X.Y`, and `:latest` tags and creates a Gitea Release.
 

docs/DEVELOPMENT.md

@@ -1,7 +1,5 @@
 # DEVELOPMENT.md — Linear Void Remaining Tasks
 
-> Auto-generated 2026-08-07. All completed items moved to `.github/instructions/DONE.md`.
-
 ## Test Fixtures (BLOCKED — requires ffmpeg)
 
 - [ ] Create test media fixtures in `backend/playout/testdata/`:

docs/README.md

@@ -0,0 +1,41 @@
+# Docs Folder
+
+This folder contains the documentation for the Linear Void project. The documentation is organized into several markdown files, each covering different aspects of the project.
+
+## Architecture
+
+- [Architecture](architecture/README.md) - High-level system architecture and component interactions.
+
+## API
+
+- [API](API.md) - Implemented WebSocket and REST API reference.
+
+## Deployment
+
+- [Deployment](DEPLOYMENT.md) - Production deployment and operational runbook.
+
+## Monitoring
+
+- [Monitoring](MONITORING.md) - Metrics, dashboards, and monitoring troubleshooting.
+
+## Security
+
+- [Security](SECURITY.md) - Security model, controls, and hardening baseline.
+
+## Setup
+
+- [Setup](SETUP.md) - Test lab setup, local development, and CI/CD workflow.
+
+## Streaming
+
+- [Streaming](STREAMING.md) - Streaming architecture, playout, and delivery details.
+
+## Development
+
+- [Development](DEVELOPMENT.md) - Remaining tasks and test fixtures for development.
+
+## Additional Resources
+
+- [Marketing](marketing/README.md) - Marketing materials and resources.
+- [Operations](operations/README.md) - Operational procedures and checklists.
+- [Incident Runbook](incident-runbook.md) - Incident response and disaster recovery procedures.

docs/architecture/README.md

@@ -87,10 +87,12 @@
 
 ## Companion Documentation
 
-- [API.md](../../API.md) - Implemented WebSocket and REST API reference.
+- [API.md](../API.md) - Implemented WebSocket and REST API reference.
-- [DEPLOYMENT.md](../../DEPLOYMENT.md) - Production deployment and operational runbook.
+- [DEPLOYMENT.md](../DEPLOYMENT.md) - Production deployment and operational runbook.
-- [MONITORING.md](../../MONITORING.md) - Metrics, dashboards, and monitoring troubleshooting.
+- [MONITORING.md](../MONITORING.md) - Metrics, dashboards, and monitoring troubleshooting.
-- [SECURITY.md](../../SECURITY.md) - Security model, controls, and hardening baseline.
+- [SECURITY.md](../SECURITY.md) - Security model, controls, and hardening baseline.
+- [SETUP.md](../SETUP.md) - Test lab setup, local development, and CI/CD workflow.
+- [STREAMING.md](../STREAMING.md) - Streaming architecture, playout, and delivery details.
 
 ## Introduction and Goals