fix: add missing @Inject() decorators and fix coord workspace root detection

- Add @Inject() to all gateway constructor params (required without emitDecoratorMetadata)
  - AgentService: ProviderService, CoordService
  - RoutingService: ProviderService
  - ProvidersController: ProviderService, RoutingService
  - SessionsController: AgentService
- Fix coord controller ALLOWED_ROOTS to walk up to monorepo root (pnpm-workspace.yaml)
- Gateway now boots and serves all routes correctly

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

apps/gateway/src/agent/agent.service.ts

@@ -40,9 +40,9 @@ export class AgentService implements OnModuleDestroy {
   private readonly customTools: ToolDefinition[];
 
   constructor(
-    private readonly providerService: ProviderService,
+    @Inject(ProviderService) private readonly providerService: ProviderService,
     @Inject(BRAIN) private readonly brain: Brain,
-    private readonly coordService: CoordService,
+    @Inject(CoordService) private readonly coordService: CoordService,
   ) {
     this.customTools = [...createBrainTools(brain), ...createCoordTools(coordService)];
     this.logger.log(`Registered ${this.customTools.length} custom tools`);

apps/gateway/src/agent/providers.controller.ts

@@ -1,4 +1,4 @@
-import { Body, Controller, Get, Post, UseGuards } from '@nestjs/common';
+import { Body, Controller, Get, Inject, Post, UseGuards } from '@nestjs/common';
 import type { RoutingCriteria } from '@mosaic/types';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { ProviderService } from './provider.service.js';
@@ -8,8 +8,8 @@ import { RoutingService } from './routing.service.js';
 @UseGuards(AuthGuard)
 export class ProvidersController {
   constructor(
-    private readonly providerService: ProviderService,
-    private readonly routingService: RoutingService,
+    @Inject(ProviderService) private readonly providerService: ProviderService,
+    @Inject(RoutingService) private readonly routingService: RoutingService,
   ) {}
 
   @Get()

apps/gateway/src/agent/routing.service.ts

@@ -1,4 +1,4 @@
-import { Injectable, Logger } from '@nestjs/common';
+import { Inject, Injectable, Logger } from '@nestjs/common';
 import type { ModelInfo } from '@mosaic/types';
 import type { RoutingCriteria, RoutingResult, CostTier } from '@mosaic/types';
 import { ProviderService } from './provider.service.js';
@@ -14,7 +14,7 @@ const COST_TIER_THRESHOLDS: Record<CostTier, { maxInput: number }> = {
 export class RoutingService {
   private readonly logger = new Logger(RoutingService.name);
 
-  constructor(private readonly providerService: ProviderService) {}
+  constructor(@Inject(ProviderService) private readonly providerService: ProviderService) {}
 
   /**
    * Select the best available model for the given criteria.

apps/gateway/src/agent/sessions.controller.ts

@@ -4,6 +4,7 @@ import {
   Get,
   HttpCode,
   HttpStatus,
+  Inject,
   NotFoundException,
   Param,
   UseGuards,
@@ -14,7 +15,7 @@ import { AgentService } from './agent.service.js';
 @Controller('api/sessions')
 @UseGuards(AuthGuard)
 export class SessionsController {
-  constructor(private readonly agentService: AgentService) {}
+  constructor(@Inject(AgentService) private readonly agentService: AgentService) {}
 
   @Get()
   list() {

apps/gateway/src/coord/coord.controller.ts

@@ -8,12 +8,30 @@ import {
   Query,
   UseGuards,
 } from '@nestjs/common';
+import fs from 'node:fs';
 import path from 'node:path';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { CoordService } from './coord.service.js';
 
+/** Walk up from cwd to find the monorepo root (has pnpm-workspace.yaml). */
+function findMonorepoRoot(start: string): string {
+  let dir = start;
+  for (let i = 0; i < 5; i++) {
+    try {
+      fs.accessSync(path.join(dir, 'pnpm-workspace.yaml'));
+      return dir;
+    } catch {
+      const parent = path.dirname(dir);
+      if (parent === dir) break;
+      dir = parent;
+    }
+  }
+  return start;
+}
+
 /** Only paths under these roots are allowed for coord queries. */
-const ALLOWED_ROOTS = [process.cwd()];
+const WORKSPACE_ROOT = process.env['MOSAIC_WORKSPACE_ROOT'] ?? findMonorepoRoot(process.cwd());
+const ALLOWED_ROOTS = [process.cwd(), WORKSPACE_ROOT];
 
 function resolveAndValidatePath(raw: string | undefined): string {
   const resolved = path.resolve(raw ?? process.cwd());