feat(P4-001): @mosaic/memory — preference + insight stores

Add memory tables to DB schema (preferences, insights with pgvector
embedding column, agent_logs, skills, summarization_jobs). Implement
PreferencesRepo (CRUD + upsert) and InsightsRepo (CRUD + semantic
search + relevance decay). Define VectorStore and EmbeddingProvider
interfaces for future provider abstraction. Wire MemoryModule into
gateway with REST endpoints at /api/memory/*.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/gateway/package.json

@@ -18,6 +18,7 @@
     "@mosaic/brain": "workspace:^",
     "@mosaic/coord": "workspace:^",
     "@mosaic/db": "workspace:^",
+    "@mosaic/memory": "workspace:^",
     "@mosaic/types": "workspace:^",
     "@nestjs/common": "^11.0.0",
     "@nestjs/core": "^11.0.0",

apps/gateway/src/app.module.ts

@@ -10,6 +10,7 @@ import { ProjectsModule } from './projects/projects.module.js';
 import { MissionsModule } from './missions/missions.module.js';
 import { TasksModule } from './tasks/tasks.module.js';
 import { CoordModule } from './coord/coord.module.js';
+import { MemoryModule } from './memory/memory.module.js';
 
 @Module({
   imports: [
@@ -23,6 +24,7 @@ import { CoordModule } from './coord/coord.module.js';
     MissionsModule,
     TasksModule,
     CoordModule,
+    MemoryModule,
   ],
   controllers: [HealthController],
 })

apps/gateway/src/memory/memory.controller.ts

@@ -0,0 +1,108 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  NotFoundException,
+  Param,
+  Post,
+  Query,
+  UseGuards,
+} from '@nestjs/common';
+import type { Memory } from '@mosaic/memory';
+import { MEMORY } from './memory.tokens.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import type { UpsertPreferenceDto, CreateInsightDto, SearchMemoryDto } from './memory.dto.js';
+
+@Controller('api/memory')
+@UseGuards(AuthGuard)
+export class MemoryController {
+  constructor(@Inject(MEMORY) private readonly memory: Memory) {}
+
+  // ─── Preferences ────────────────────────────────────────────────────
+
+  @Get('preferences')
+  async listPreferences(@Query('userId') userId: string, @Query('category') category?: string) {
+    if (category) {
+      return this.memory.preferences.findByUserAndCategory(
+        userId,
+        category as Parameters<typeof this.memory.preferences.findByUserAndCategory>[1],
+      );
+    }
+    return this.memory.preferences.findByUser(userId);
+  }
+
+  @Get('preferences/:key')
+  async getPreference(@Query('userId') userId: string, @Param('key') key: string) {
+    const pref = await this.memory.preferences.findByUserAndKey(userId, key);
+    if (!pref) throw new NotFoundException('Preference not found');
+    return pref;
+  }
+
+  @Post('preferences')
+  async upsertPreference(@Query('userId') userId: string, @Body() dto: UpsertPreferenceDto) {
+    return this.memory.preferences.upsert({
+      userId,
+      key: dto.key,
+      value: dto.value,
+      category: dto.category,
+      source: dto.source,
+    });
+  }
+
+  @Delete('preferences/:key')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async removePreference(@Query('userId') userId: string, @Param('key') key: string) {
+    const deleted = await this.memory.preferences.remove(userId, key);
+    if (!deleted) throw new NotFoundException('Preference not found');
+  }
+
+  // ─── Insights ───────────────────────────────────────────────────────
+
+  @Get('insights')
+  async listInsights(@Query('userId') userId: string, @Query('limit') limit?: string) {
+    return this.memory.insights.findByUser(userId, limit ? Number(limit) : undefined);
+  }
+
+  @Get('insights/:id')
+  async getInsight(@Param('id') id: string) {
+    const insight = await this.memory.insights.findById(id);
+    if (!insight) throw new NotFoundException('Insight not found');
+    return insight;
+  }
+
+  @Post('insights')
+  async createInsight(@Query('userId') userId: string, @Body() dto: CreateInsightDto) {
+    return this.memory.insights.create({
+      userId,
+      content: dto.content,
+      source: dto.source,
+      category: dto.category,
+      metadata: dto.metadata,
+    });
+  }
+
+  @Delete('insights/:id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async removeInsight(@Param('id') id: string) {
+    const deleted = await this.memory.insights.remove(id);
+    if (!deleted) throw new NotFoundException('Insight not found');
+  }
+
+  // ─── Search ─────────────────────────────────────────────────────────
+
+  @Post('search')
+  async searchMemory(@Query('userId') userId: string, @Body() dto: SearchMemoryDto) {
+    // Search requires an embedding provider to be configured.
+    // For now, return empty results if no embedding is available.
+    // P4-002 will implement the full embedding + search pipeline.
+    return {
+      query: dto.query,
+      results: [],
+      message: 'Semantic search requires embedding provider (P4-002)',
+    };
+  }
+}

apps/gateway/src/memory/memory.dto.ts

@@ -0,0 +1,19 @@
+export interface UpsertPreferenceDto {
+  key: string;
+  value: unknown;
+  category?: 'communication' | 'coding' | 'workflow' | 'appearance' | 'general';
+  source?: string;
+}
+
+export interface CreateInsightDto {
+  content: string;
+  source?: 'agent' | 'user' | 'summarization' | 'system';
+  category?: 'decision' | 'learning' | 'preference' | 'fact' | 'pattern' | 'general';
+  metadata?: Record<string, unknown>;
+}
+
+export interface SearchMemoryDto {
+  query: string;
+  limit?: number;
+  maxDistance?: number;
+}

apps/gateway/src/memory/memory.module.ts

@@ -0,0 +1,20 @@
+import { Global, Module } from '@nestjs/common';
+import { createMemory, type Memory } from '@mosaic/memory';
+import type { Db } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+import { MEMORY } from './memory.tokens.js';
+import { MemoryController } from './memory.controller.js';
+
+@Global()
+@Module({
+  providers: [
+    {
+      provide: MEMORY,
+      useFactory: (db: Db): Memory => createMemory(db),
+      inject: [DB],
+    },
+  ],
+  controllers: [MemoryController],
+  exports: [MEMORY],
+})
+export class MemoryModule {}

apps/gateway/src/memory/memory.tokens.ts

@@ -0,0 +1 @@
+export const MEMORY = 'MEMORY';