feat(crdt): add Automerge document lifecycle management

Implement document-manager.ts with core CRDT operations:
- Document creation, update, merge, save/load functions
- Conversion functions between local entities and CRDT documents
- Actor ID management for client identification
- Conflict detection utilities

Completes Phase 1 of CRDT implementation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/src/client/sync/crdt/index.ts b/src/client/sync/crdt/index.ts
new file mode 100644
index 0000000..fa296bd
--- /dev/null
+++ b/src/client/sync/crdt/index.ts
@@ -0,0 +1,69 @@
+/**
+ * CRDT Module
+ *
+ * This module provides Automerge CRDT-based sync functionality for Kioku.
+ * It enables conflict-free synchronization of data between clients and server.
+ */
+
+// Document lifecycle management
+export {
+	// Core document operations
+	applyChanges,
+	// Entity to/from CRDT document conversions
+	cardToCrdtDocument,
+	crdtDocumentToCard,
+	crdtDocumentToDeck,
+	crdtDocumentToNote,
+	crdtDocumentToNoteFieldType,
+	crdtDocumentToNoteFieldValue,
+	crdtDocumentToNoteType,
+	crdtDocumentToReviewLog,
+	createDocument,
+	// Generic entity conversion
+	createDocumentFromEntity,
+	createEmptyDocument,
+	// Types
+	type DocumentChange,
+	type DocumentSnapshot,
+	deckToCrdtDocument,
+	// Actor ID management
+	getActorId,
+	getChanges,
+	// Conflict detection and utilities
+	getLastModified,
+	hasConflicts,
+	initDocumentWithActor,
+	isDeleted,
+	loadDocument,
+	loadIncremental,
+	type MergeResult,
+	mergeDocuments,
+	noteFieldTypeToCrdtDocument,
+	noteFieldValueToCrdtDocument,
+	noteToCrdtDocument,
+	noteTypeToCrdtDocument,
+	reviewLogToCrdtDocument,
+	saveDocument,
+	saveIncremental,
+	updateDocument,
+} from "./document-manager";
+// Type definitions
+export {
+	type CrdtCardDocument,
+	type CrdtDeckDocument,
+	type CrdtDocument,
+	type CrdtDocumentMap,
+	CrdtEntityType,
+	type CrdtEntityTypeValue,
+	type CrdtMetadata,
+	type CrdtNoteDocument,
+	type CrdtNoteFieldTypeDocument,
+	type CrdtNoteFieldValueDocument,
+	type CrdtNoteTypeDocument,
+	type CrdtReviewLogDocument,
+	createCrdtMetadata,
+	createDeletedCrdtMetadata,
+	createDocumentId,
+	type DocumentId,
+	parseDocumentId,
+} from "./types";