Projection primitives for SharpCoreDB.EventSourcing.

Version: v1.9.3 Package: SharpCoreDB.Projections

• ✅ Aligned package metadata and version references to the synchronized 1.9.3 release line.
• ✅ Release automation now publishes all packable SharpCoreDB packages in CI/CD.

• Projection registration and discovery
• Inline and background projection runners
• Durable checkpointing (in-memory and SharpCoreDB-backed stores)
• Hosted background worker support
• OpenTelemetry-ready projection metrics

• Package/docs synchronized to v1.9.0
• Durable checkpoint and worker guidance clarified
• Projection metrics guidance aligned with current implementation

dotnet add package SharpCoreDB.Projections --version 1.9.0

• SharpCoreDB.EventSourcing
• SharpCoreDB.CQRS

• docs/INDEX.md
• src/SharpCoreDB.Projections/NuGet.README.md