Add releases page with protocol extensions and update navigation

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

content/docs/introduction/meta.json

@@ -7,6 +7,7 @@
     "metadata-driven",
     "architecture",
     "design-principles",
-    "terminology"
+    "terminology",
+    "releases"
   ]
 }

content/docs/introduction/releases.mdx

@@ -0,0 +1,300 @@
+---
+title: Recent Updates & Releases
+description: Latest features, improvements, and protocol extensions in ObjectStack
+---
+
+# Recent Updates & Releases
+
+Stay up-to-date with the latest features and improvements to the ObjectStack protocol.
+
+## Latest Release (2026-01-27)
+
+### 🎯 ObjectQL (Data Layer) - 100% Completion!
+
+We've completed all advanced query features and AI/ML field types, bringing ObjectQL to feature parity with enterprise database systems.
+
+#### Window Functions ✅
+
+Full support for analytical window functions:
+
+**Ranking Functions:**
+- `ROW_NUMBER()` - Sequential numbering within partitions
+- `RANK()` - Ranking with gaps for ties
+- `DENSE_RANK()` - Ranking without gaps
+- `NTILE(n)` - Distribution into n buckets
+
+**Navigation Functions:**
+- `LAG(field, offset)` - Access previous row values
+- `LEAD(field, offset)` - Access next row values
+- `FIRST_VALUE(field)` - First value in window
+- `LAST_VALUE(field)` - Last value in window
+
+**Aggregate Window Functions:**
+- `SUM()`, `AVG()`, `COUNT()`, `MIN()`, `MAX()` - With OVER clause
+
+**Example Usage:**
+```typescript
+import { ObjectQL } from '@objectstack/objectql';
+
+const query = {
+  from: 'opportunity',
+  select: [
+    'account_name',
+    'amount',
+    { 
+      window: {
+        function: 'ROW_NUMBER',
+        partitionBy: ['account_name'],
+        orderBy: [{ field: 'amount', direction: 'desc' }],
+      },
+      as: 'rank_in_account'
+    },
+    {
+      window: {
+        function: 'SUM',
+        field: 'amount',
+        partitionBy: ['account_name'],
+      },
+      as: 'total_account_revenue'
+    }
+  ],
+};
+```
+
+#### HAVING Clause ✅
+
+Filter aggregated results in GROUP BY queries:
+
+```typescript
+const query = {
+  from: 'opportunity',
+  select: [
+    'stage',
+    { aggregate: 'SUM', field: 'amount', as: 'total_revenue' },
+    { aggregate: 'COUNT', field: 'id', as: 'deal_count' },
+  ],
+  groupBy: ['stage'],
+  having: [
+    { field: 'total_revenue', operator: 'greaterThan', value: 1000000 },
+    { field: 'deal_count', operator: 'greaterThan', value: 10 },
+  ],
+};
+```
+
+#### DISTINCT Queries ✅
+
+Full support for SELECT DISTINCT:
+
+```typescript
+// Distinct single field
+const query = {
+  from: 'contact',
+  select: ['industry'],
+  distinct: true,
+};
+
+// Distinct multiple fields
+const query = {
+  from: 'opportunity',
+  select: ['stage', 'type'],
+  distinct: true,
+};
+
+// Distinct with aggregate
+const query = {
+  from: 'account',
+  select: [
+    { aggregate: 'COUNT', field: 'industry', distinct: true, as: 'unique_industries' },
+  ],
+};
+```
+
+#### Subqueries ✅
+
+Nested queries in JOIN clauses:
+
+```typescript
+const query = {
+  from: 'account',
+  select: ['name', 'industry', 'total_deals'],
+  joins: [
+    {
+      type: 'left',
+      subquery: {
+        from: 'opportunity',
+        select: [
+          'account_id',
+          { aggregate: 'COUNT', field: 'id', as: 'total_deals' },
+        ],
+        groupBy: ['account_id'],
+      },
+      alias: 'deal_stats',
+      on: [{ left: 'id', operator: 'equals', right: 'deal_stats.account_id' }],
+    },
+  ],
+};
+```
+
+#### Vector Field Type ✅
+
+AI/ML embeddings for semantic search and RAG workflows:
+
+```typescript
+import { Field } from '@objectstack/spec';
+
+const KnowledgeArticle = {
+  name: 'knowledge_article',
+  fields: {
+    title: Field.text({ required: true }),
+    content: Field.textarea({ required: true }),
+    
+    // Store embeddings for semantic search
+    content_embedding: Field.vector({
+      label: 'Content Embedding',
+      dimensions: 1536, // OpenAI ada-002
+      description: 'Vector representation for semantic search',
+    }),
+  },
+};
+
+// Query by semantic similarity
+const similarArticles = await ql.query({
+  from: 'knowledge_article',
+  where: [
+    {
+      field: 'content_embedding',
+      operator: 'similar_to',
+      value: queryEmbedding,
+      threshold: 0.8, // Cosine similarity threshold
+    },
+  ],
+  limit: 5,
+});
+```
+
+**Supported Operations:**
+- `similar_to` - Cosine similarity search
+- `knn` - K-nearest neighbors
+- Integration with vector databases (Pinecone, Weaviate, pgvector)
+
+#### Location Field Type ✅
+
+GPS coordinates for geospatial applications:
+
+```typescript
+import { Field } from '@objectstack/spec';
+
+const Store = {
+  name: 'store',
+  fields: {
+    name: Field.text({ required: true }),
+    address: Field.address(),
+    
+    // Store GPS coordinates
+    location: Field.location({
+      label: 'Store Location',
+      description: 'GPS coordinates for mapping',
+    }),
+  },
+};
+
+// Query by distance
+const nearbyStores = await ql.query({
+  from: 'store',
+  where: [
+    {
+      field: 'location',
+      operator: 'within_radius',
+      value: {
+        lat: 37.7749,
+        lng: -122.4194,
+        radius: 10, // kilometers
+      },
+    },
+  ],
+  orderBy: [
+    {
+      field: 'location',
+      direction: 'distance_from',
+      value: { lat: 37.7749, lng: -122.4194 },
+    },
+  ],
+});
+```
+
+**Supported Operations:**
+- `within_radius` - Find locations within distance
+- `within_bounds` - Find locations in bounding box
+- `distance_from` - Calculate distance
+- Integration with mapping services (Google Maps, Mapbox)
+
+---
+
+## Previous Releases
+
+### v1.3.0 (2026-01-15) - Advanced Query Features
+
+- Added support for Common Table Expressions (CTE)
+- Improved query optimizer performance
+- Added transaction isolation levels
+
+### v1.2.0 (2025-12-20) - AI Protocol
+
+- Complete AI protocol suite (8 schemas)
+- Agent orchestration and RAG pipeline
+- Natural language query processing
+- AI cost tracking and budgeting
+
+### v1.1.0 (2025-11-30) - UI Enhancements
+
+- Advanced theming system
+- Custom widget lifecycle hooks
+- Dashboard grid layouts
+- Report builder improvements
+
+### v1.0.0 (2025-10-15) - Initial Release
+
+- Core ObjectQL, ObjectUI, ObjectOS protocols
+- PostgreSQL and MongoDB drivers
+- Basic plugin system
+- Documentation site
+
+---
+
+## Migration Guides
+
+### Upgrading to v1.4.0
+
+The new window functions and vector/location field types are backward compatible. No breaking changes.
+
+**To use vector fields:**
+1. Update `@objectstack/spec` to `^1.4.0`
+2. Add vector database driver (e.g., `@objectstack/driver-pgvector`)
+3. Define vector fields in your objects
+
+**To use location fields:**
+1. Update `@objectstack/spec` to `^1.4.0`
+2. Use with any driver (coordinates stored as JSON)
+3. For advanced geospatial queries, use PostGIS driver
+
+---
+
+## Roadmap
+
+### Q1 2026
+- [ ] GraphQL Gateway
+- [ ] Real-time subscriptions (WebSocket)
+- [ ] Multi-tenant data isolation
+
+### Q2 2026
+- [ ] Performance monitoring dashboard
+- [ ] Advanced caching strategies
+- [ ] Plugin marketplace
+
+---
+
+## Get Involved
+
+- **Report Issues:** [GitHub Issues](https://github.com/objectstack-ai/spec/issues)
+- **Contribute:** [Contributing Guide](/docs/introduction/contributing)
+- **Discuss:** [GitHub Discussions](https://github.com/objectstack-ai/spec/discussions)