Initial import of the CBDDC codebase with docs and tests. Add a .NET-focused gitignore to keep generated artifacts out of source control.

docs/index.md

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+
+# CBDDC Documentation
+
+Welcome to the CBDDC documentation for **version 0.9.0**.
+
+## What's New in v0.9.0
+
+Version 0.9.0 brings enhanced ASP.NET Core support, improved EF Core runtime stability, and refined synchronization and persistence layers.
+
+- **ASP.NET Core Enhancements**: Improved sample application with better error handling
+- **EF Core Stability**: Fixed runtime issues and improved persistence layer reliability
+- **Sync & Persistence**: Enhanced stability across all persistence providers
+- **Production Ready**: All features tested and stable for production use
+
+See the [CHANGELOG](https://github.com/CBDDC/ZB.MOM.WW.CBDDC.Net/blob/main/CHANGELOG.md) for complete details.
+
+## Documentation
+
+### Getting Started
+*   [**Getting Started**](getting-started.html) - Installation, basic setup, and your first CBDDC application
+
+### Core Concepts
+*   [Architecture](architecture.html) - Understanding HLC, Gossip Protocol, and P2P mesh networking
+*   [API Reference](api-reference.html) - Complete API documentation and examples
+*   [Querying](querying.html) - Data querying patterns and LINQ support
+
+### Persistence & Storage
+*   [Persistence Providers](persistence-providers.html) - SQLite, EF Core, PostgreSQL comparison and configuration
+*   [Deployment Modes](deployment-modes.html) - Single-cluster deployment strategy
+
+### Networking & Security
+*   [Security](security.html) - Encryption, authentication, and secure networking
+*   [Conflict Resolution](conflict-resolution.html) - LWW and Recursive Merge strategies
+*   [Network Telemetry](network-telemetry.html) - Monitoring and diagnostics
+*   [Dynamic Reconfiguration](dynamic-reconfiguration.html) - Runtime configuration and leader election
+*   [Remote Peer Configuration](remote-peer-configuration.html) - Managing remote peers and tracking lifecycle
+*   [Upgrade: Peer-Confirmed Pruning](upgrade-peer-confirmed-pruning.html) - Adoption and rollout notes
+
+### Deployment & Operations
+*   [Deployment (LAN)](deployment-lan.html) - Platform-specific deployment instructions
+*   [Production Hardening](production-hardening.html) - Configuration, monitoring, and best practices
+*   [Peer Deprecation & Removal Runbook](peer-deprecation-removal-runbook.html) - Operational deprecation/removal workflow
+
+## Previous Versions
+
+- [v0.8.x Documentation](v0.8/getting-started.html)
+- [v0.7.x Documentation](v0.7/getting-started.html)
+- [v0.6.x Documentation](v0.6/getting-started.html)
+
+## Links
+
+*   [GitHub Repository](https://github.com/CBDDC/ZB.MOM.WW.CBDDC.Net)
+*   [NuGet Packages](https://www.nuget.org/packages?q=CBDDC)
+*   [Changelog](https://github.com/CBDDC/ZB.MOM.WW.CBDDC.Net/blob/main/CHANGELOG.md)