docs: document topic alias and semantic search APIs

README.md

@@ -12,12 +12,15 @@ IdentityDB stores memory as a graph made of:
 
 A single fact like `I have worked with TypeScript since 2025.` can connect the topics `I`, `TypeScript`, and `2025` at the same time.
 
-## Current foundation capabilities
+## Current capabilities
 
 - SQLite, PostgreSQL, MySQL, and MariaDB connection adapters
-- Automatic schema initialization for `topics`, `facts`, and `fact_topics`
+- Automatic schema initialization for `topics`, `facts`, `fact_topics`, `topic_relations`, `topic_aliases`, and `fact_embeddings`
 - High-level APIs for adding topics and facts
-- Query APIs for listing topics, loading topic-scoped facts, and finding connected facts/topics
+- Topic hierarchy APIs for parent/child traversal and lineage lookup
+- Topic alias and canonical resolution APIs so facts and queries can resolve alternate names
+- Semantic fact indexing and search APIs built around provider-agnostic embeddings
+- Dedup-aware ingestion hooks that can reuse an existing fact when a semantic near-duplicate is detected
 - Pluggable fact extraction so callers can use a small LLM or a deterministic extractor
 
 ## Install
@@ -29,7 +32,7 @@ bun install
 ## Quick start
 
 ```ts
-import { IdentityDB, NaiveExtractor } from 'identitydb';
+import { IdentityDB, NaiveExtractor, type EmbeddingProvider } from 'identitydb';
 
 const db = await IdentityDB.connect({
   client: 'sqlite',
@@ -58,15 +61,58 @@ await db.addFact({
   ],
 });
 
-const topic = await db.getTopicByName('TypeScript', { includeFacts: true });
+await db.linkTopics({
-const connected = await db.findConnectedTopics('TypeScript');
+  parentName: 'programming language',
+  childName: 'TypeScript',
+});
 
-console.log(topic?.facts.map((fact) => fact.statement));
+await db.addTopicAlias('TypeScript', 'TS');
+
+const provider: EmbeddingProvider = {
+  model: 'example-embedding-v1',
+  dimensions: 3,
+  async embed(input) {
+    if (input.toLowerCase().includes('typescript')) {
+      return [1, 0, 0];
+    }
+
+    return [0, 1, 0];
+  },
+};
+
+await db.indexFactEmbeddings({ provider });
+
+const topic = await db.getTopicByName('TS', { includeFacts: true });
+const children = await db.getTopicChildren('programming language');
+const lineage = await db.getTopicLineage('TS');
+const connected = await db.findConnectedTopics('TypeScript');
+const matches = await db.searchFacts({
+  query: 'TypeScript experience',
+  provider,
+  limit: 5,
+});
+
+console.log(topic?.name);
+console.log(children.map((entry) => entry.name));
+console.log(lineage.map((entry) => entry.name));
 console.log(connected.map((entry) => [entry.name, entry.sharedFactCount]));
+console.log(matches.map((entry) => [entry.statement, entry.score]));
 
 await db.close();
 ```
 
+## Semantic ingestion and duplicate detection
+
+If you provide an embedding provider during ingestion, IdentityDB can index the new fact automatically and reuse an existing fact when a semantic near-duplicate is already present.
+
+```ts
+await db.ingestStatement('Bun makes TypeScript tooling fast.', {
+  extractor: new NaiveExtractor(),
+  embeddingProvider: provider,
+  duplicateThreshold: 0.95,
+});
+```
+
 ## Development
 
 ```bash
@@ -77,6 +123,9 @@ bun run build
 
 ## Current status
 
-This repository is in active foundation development.
+This repository is in active MVP expansion development.
 
-See `docs/plans/2026-05-11-identitydb-foundation.md` for the current implementation plan.
+See these implementation plans for the current roadmap:
+
+- `docs/plans/2026-05-11-identitydb-foundation.md`
+- `docs/plans/2026-05-11-identitydb-memory-expansion.md`