feat: Add agent preview integration with auto-teardown and simplified commands

- Add agentId label to preview containers (cw.agent-id) for tracking
- Add startForAgent/stopByAgentId methods to PreviewManager
- Auto-teardown: previews torn down on agent:stopped event
- Conditional preview prompt injection for execute/refine/discuss agents
- Agent-simplified CLI: cw preview start/stop --agent <id>
- cw preview setup command with --auto mode for guided config generation
- hasPreviewConfig hint on cw project register output
- New tRPC procedures: startPreviewForAgent, stopPreviewByAgent

apps/server/trpc/routers/preview.ts

@@ -4,7 +4,7 @@
 
 import { z } from 'zod';
 import type { ProcedureBuilder } from '../trpc.js';
-import { requirePreviewManager } from './_helpers.js';
+import { requirePreviewManager, requireAgentManager } from './_helpers.js';
 
 export function previewProcedures(publicProcedure: ProcedureBuilder) {
   return {
@@ -16,12 +16,29 @@ export function previewProcedures(publicProcedure: ProcedureBuilder) {
         branch: z.string().min(1),
         mode: z.enum(['preview', 'dev']).default('preview'),
         worktreePath: z.string().optional(),
+        agentId: z.string().min(1).optional(),
       }))
       .mutation(async ({ ctx, input }) => {
         const previewManager = requirePreviewManager(ctx);
         return previewManager.start(input);
       }),
 
+    startPreviewForAgent: publicProcedure
+      .input(z.object({ agentId: z.string().min(1) }))
+      .mutation(async ({ ctx, input }) => {
+        const previewManager = requirePreviewManager(ctx);
+        const agentManager = requireAgentManager(ctx);
+        return previewManager.startForAgent(input.agentId, agentManager);
+      }),
+
+    stopPreviewByAgent: publicProcedure
+      .input(z.object({ agentId: z.string().min(1) }))
+      .mutation(async ({ ctx, input }) => {
+        const previewManager = requirePreviewManager(ctx);
+        await previewManager.stopByAgentId(input.agentId);
+        return { success: true };
+      }),
+
     stopPreview: publicProcedure
       .input(z.object({
         previewId: z.string().min(1),

apps/server/trpc/routers/project.ts

@@ -5,7 +5,7 @@
 import { TRPCError } from '@trpc/server';
 import { z } from 'zod';
 import { join } from 'node:path';
-import { rm } from 'node:fs/promises';
+import { rm, access } from 'node:fs/promises';
 import type { ProcedureBuilder } from '../trpc.js';
 import { requireProjectRepository, requireProjectSyncManager } from './_helpers.js';
 import { cloneProject } from '../../git/clone.js';
@@ -69,7 +69,17 @@ export function projectProcedures(publicProcedure: ProcedureBuilder) {
           }
         }
 
-        return project;
+        // Check for preview config
+        let hasPreviewConfig = false;
+        if (ctx.workspaceRoot) {
+          const clonePath = join(ctx.workspaceRoot, getProjectCloneDir(input.name, project.id));
+          try {
+            await access(join(clonePath, '.cw-preview.yml'));
+            hasPreviewConfig = true;
+          } catch { /* no config */ }
+        }
+
+        return { ...project, hasPreviewConfig };
       }),
 
     listProjects: publicProcedure