feat: gateway CRUD routes — conversations, projects, missions, tasks (P1-005/006) (#72)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/missions/missions.controller.ts

@@ -0,0 +1,60 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  NotFoundException,
+  Param,
+  Patch,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import type { Brain } from '@mosaic/brain';
+import { BRAIN } from '../brain/brain.module.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import type { CreateMissionDto, UpdateMissionDto } from './missions.dto.js';
+
+@Controller('api/missions')
+@UseGuards(AuthGuard)
+export class MissionsController {
+  constructor(@Inject(BRAIN) private readonly brain: Brain) {}
+
+  @Get()
+  async list() {
+    return this.brain.missions.findAll();
+  }
+
+  @Get(':id')
+  async findOne(@Param('id') id: string) {
+    const mission = await this.brain.missions.findById(id);
+    if (!mission) throw new NotFoundException('Mission not found');
+    return mission;
+  }
+
+  @Post()
+  async create(@Body() dto: CreateMissionDto) {
+    return this.brain.missions.create({
+      name: dto.name,
+      description: dto.description,
+      projectId: dto.projectId,
+      status: dto.status,
+    });
+  }
+
+  @Patch(':id')
+  async update(@Param('id') id: string, @Body() dto: UpdateMissionDto) {
+    const mission = await this.brain.missions.update(id, dto);
+    if (!mission) throw new NotFoundException('Mission not found');
+    return mission;
+  }
+
+  @Delete(':id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async remove(@Param('id') id: string) {
+    const deleted = await this.brain.missions.remove(id);
+    if (!deleted) throw new NotFoundException('Mission not found');
+  }
+}