feat: implement service-feed package with IFeedService contract and system objects

ROADMAP.md

@@ -304,11 +304,13 @@ business/custom objects, aligning with industry best practices (e.g., ServiceNow
 |:---|:---:|:---|:---|
 | `II18nService` | **P1** | `@objectstack/service-i18n` | Map-backed translation with locale resolution |
 | `IRealtimeService` | **P1** | `@objectstack/service-realtime` | WebSocket/SSE push (replaces Studio setTimeout hack) |
+| `IFeedService` | **P1** | `@objectstack/service-feed` | ✅ Feed/Chatter with comments, reactions, subscriptions |
 | `ISearchService` | **P1** | `@objectstack/service-search` | In-memory search first, then Meilisearch driver |
 | `INotificationService` | **P2** | `@objectstack/service-notification` | Email adapter (console logger in dev mode) |
 
 - [x] `service-i18n` — Implement `II18nService` with file-based locale loading
 - [x] `service-realtime` — Implement `IRealtimeService` with WebSocket + in-memory pub/sub
+- [x] `service-feed` — Implement `IFeedService` with in-memory adapter (Feed CRUD, Reactions, Subscriptions, Threading)
 - [ ] `service-search` — Implement `ISearchService` with in-memory search + Meilisearch adapter
 - [ ] `service-notification` — Implement `INotificationService` with email adapter
 
@@ -571,19 +573,20 @@ Final polish and advanced features.
 | 12 | Job Service | `IJobService` | ✅ | `@objectstack/service-job` | Interval + cron skeleton |
 | 13 | Storage Service | `IStorageService` | ✅ | `@objectstack/service-storage` | Local FS + S3 skeleton |
 | 14 | Realtime Service | `IRealtimeService` | ✅ | `@objectstack/service-realtime` | In-memory pub/sub |
-| 15 | Search Service | `ISearchService` | ❌ | `@objectstack/service-search` (planned) | Spec only |
-| 16 | Notification Service | `INotificationService` | ❌ | `@objectstack/service-notification` (planned) | Spec only |
-| 17 | AI Service | `IAIService` | ❌ | `@objectstack/service-ai` (planned) | Spec only |
-| 18 | Automation Service | `IAutomationService` | ✅ | `@objectstack/service-automation` | Plugin-based DAG engine (MVP) |
-| 19 | Workflow Service | `IWorkflowService` | ❌ | `@objectstack/service-workflow` (planned) | Spec only |
-| 20 | GraphQL Service | `IGraphQLService` | ❌ | `@objectstack/service-graphql` (planned) | Spec only |
-| 21 | i18n Service | `II18nService` | ✅ | `@objectstack/service-i18n` | File-based locale loading |
-| 22 | UI Service | `IUIService` | ⚠️ | — | **Deprecated** — merged into `IMetadataService` |
-| 23 | Schema Driver | `ISchemaDriver` | ❌ | — | Spec only |
-| 24 | Startup Orchestrator | `IStartupOrchestrator` | ❌ | — | Kernel handles basics |
-| 25 | Plugin Validator | `IPluginValidator` | ❌ | — | Spec only |
-
-**Summary:** 13 fully implemented · 2 partially implemented · 10 specification only
+| 15 | Feed Service | `IFeedService` | ✅ | `@objectstack/service-feed` | In-memory feed/chatter (comments, reactions, subscriptions) |
+| 16 | Search Service | `ISearchService` | ❌ | `@objectstack/service-search` (planned) | Spec only |
+| 17 | Notification Service | `INotificationService` | ❌ | `@objectstack/service-notification` (planned) | Spec only |
+| 18 | AI Service | `IAIService` | ❌ | `@objectstack/service-ai` (planned) | Spec only |
+| 19 | Automation Service | `IAutomationService` | ✅ | `@objectstack/service-automation` | Plugin-based DAG engine (MVP) |
+| 20 | Workflow Service | `IWorkflowService` | ❌ | `@objectstack/service-workflow` (planned) | Spec only |
+| 21 | GraphQL Service | `IGraphQLService` | ❌ | `@objectstack/service-graphql` (planned) | Spec only |
+| 22 | i18n Service | `II18nService` | ✅ | `@objectstack/service-i18n` | File-based locale loading |
+| 23 | UI Service | `IUIService` | ⚠️ | — | **Deprecated** — merged into `IMetadataService` |
+| 24 | Schema Driver | `ISchemaDriver` | ❌ | — | Spec only |
+| 25 | Startup Orchestrator | `IStartupOrchestrator` | ❌ | — | Kernel handles basics |
+| 26 | Plugin Validator | `IPluginValidator` | ❌ | — | Spec only |
+
+**Summary:** 14 fully implemented · 2 partially implemented · 10 specification only
 
 ---
 
@@ -612,6 +615,7 @@ Final polish and advanced features.
 | `@objectstack/service-storage` | 3.0.6 | 8 | ✅ Stable | 7/10 |
 | `@objectstack/service-i18n` | 3.0.7 | 20 | ✅ Stable | 7/10 |
 | `@objectstack/service-realtime` | 3.0.7 | 14 | ✅ Stable | 7/10 |
+| `@objectstack/service-feed` | 3.0.7 | 40 | ✅ Stable | 7/10 |
 | `@objectstack/nextjs` | 3.0.2 | ✅ | ✅ Stable | 10/10 |
 | `@objectstack/nestjs` | 3.0.2 | ✅ | ✅ Stable | 10/10 |
 | `@objectstack/hono` | 3.0.2 | ✅ | ✅ Stable | 10/10 |

packages/services/service-feed/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "@objectstack/service-feed",
+  "version": "3.0.7",
+  "license": "Apache-2.0",
+  "description": "Feed/Chatter Service for ObjectStack — implements IFeedService with in-memory adapter for comments, reactions, field changes, and record subscriptions",
+  "type": "module",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsup --config ../../../tsup.config.ts",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "@objectstack/core": "workspace:*",
+    "@objectstack/spec": "workspace:*"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0",
+    "vitest": "^4.0.18",
+    "@types/node": "^25.2.3"
+  }
+}

packages/services/service-feed/src/feed-service-plugin.ts

@@ -0,0 +1,58 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+import type { Plugin, PluginContext } from '@objectstack/core';
+import { InMemoryFeedAdapter } from './in-memory-feed-adapter.js';
+import type { InMemoryFeedAdapterOptions } from './in-memory-feed-adapter.js';
+
+/**
+ * Configuration options for the FeedServicePlugin.
+ */
+export interface FeedServicePluginOptions {
+  /** Feed adapter type (default: 'memory') */
+  adapter?: 'memory';
+  /** Options for the in-memory adapter */
+  memory?: InMemoryFeedAdapterOptions;
+}
+
+/**
+ * FeedServicePlugin — Production IFeedService implementation.
+ *
+ * Registers a Feed/Chatter service with the kernel during the init phase.
+ * Currently supports in-memory storage for single-process environments.
+ *
+ * @example
+ * ```ts
+ * import { ObjectKernel } from '@objectstack/core';
+ * import { FeedServicePlugin } from '@objectstack/service-feed';
+ *
+ * const kernel = new ObjectKernel();
+ * kernel.use(new FeedServicePlugin());
+ * await kernel.bootstrap();
+ *
+ * const feed = kernel.getService('feed');
+ * const item = await feed.createFeedItem({
+ *   object: 'account',
+ *   recordId: 'rec_123',
+ *   type: 'comment',
+ *   actor: { type: 'user', id: 'user_1', name: 'Alice' },
+ *   body: 'Great progress!',
+ * });
+ * ```
+ */
+export class FeedServicePlugin implements Plugin {
+  name = 'com.objectstack.service.feed';
+  version = '1.0.0';
+  type = 'standard';
+
+  private readonly options: FeedServicePluginOptions;
+
+  constructor(options: FeedServicePluginOptions = {}) {
+    this.options = { adapter: 'memory', ...options };
+  }
+
+  async init(ctx: PluginContext): Promise<void> {
+    const feed = new InMemoryFeedAdapter(this.options.memory);
+    ctx.registerService('feed', feed);
+    ctx.logger.info('FeedServicePlugin: registered in-memory feed adapter');
+  }
+}