Implements optional git-based version control for information spaces:
- HistoryConfig model for configuring history tracking
- Commit, Branch, HistoryEntry, DiffResult models
- IHistoryBackend and IHistoryQuery interfaces
- GitHistoryBackend using git CLI for version control
- GitHistoryEventHandler for event-driven auto-commits
- HistoryEventCoordinator for managing space history
- HistoryQueryService for high-level history queries
- Automatic commits on DOCUMENT_ADDED/REMOVED/CONTENT_CHANGED events
- Support for:
* Commit log with pagination and filtering
* Diff between versions
* File content at specific versions
* Branch creation and switching
* Version restoration
* Uncommitted changes detection
- 43 comprehensive unit tests with git availability checks
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Implements space composition and inheritance features:
- SpaceReference model for space-to-space references (includes, extends, links_to, composed_of)
- Variable inheritance through parent chain with local override
- Config inheritance with source tracking
- Access control models (SpacePermission, SpaceRole, AccessLevel)
- InheritanceResolver for walking parent chains
- AccessControlService for permission management
- ComposableSpaceService integrating all composability features
- Circular reference detection for EXTENDS references
- SQLite repositories for references and permissions
- 57 comprehensive unit tests
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>