feat: wire autoFix into PostToolUse hook flow (Task 5)

Add auto-fix lint/test check after existing PostToolUse hooks in
runPostToolUseHooks. When autoFix is configured in settings, runs
lint/test commands after file_edit/file_write tools and yields
errors as hook_additional_context for the model to act on.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/services/autoFix/autoFixIntegration.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, test } from 'bun:test'
+import { getAutoFixConfig } from './autoFixConfig.js'
+import { shouldRunAutoFix, buildAutoFixContext } from './autoFixHook.js'
+import { runAutoFixCheck } from './autoFixRunner.js'
+
+describe('autoFix end-to-end flow', () => {
+  test('full flow: config → shouldRun → check → context', async () => {
+    const config = getAutoFixConfig({
+      enabled: true,
+      lint: 'echo "error: unused" && exit 1',
+      maxRetries: 2,
+      timeout: 5000,
+    })
+    expect(config).not.toBeNull()
+    expect(shouldRunAutoFix('file_edit', config)).toBe(true)
+
+    const result = await runAutoFixCheck({
+      lint: config!.lint,
+      test: config!.test,
+      timeout: config!.timeout,
+      cwd: '/tmp',
+    })
+    expect(result.hasErrors).toBe(true)
+
+    const context = buildAutoFixContext(result)
+    expect(context).not.toBeNull()
+    expect(context).toContain('AUTO-FIX')
+    expect(context).toContain('unused')
+  })
+
+  test('full flow: no errors = no context', async () => {
+    const config = getAutoFixConfig({
+      enabled: true,
+      lint: 'echo "all clean"',
+      timeout: 5000,
+    })
+    const result = await runAutoFixCheck({
+      lint: config!.lint,
+      timeout: config!.timeout,
+      cwd: '/tmp',
+    })
+    expect(result.hasErrors).toBe(false)
+    const context = buildAutoFixContext(result)
+    expect(context).toBeNull()
+  })
+})

src/services/tools/toolHooks.ts

@@ -29,6 +29,9 @@ import {
 } from '../../utils/permissions/PermissionResult.js'
 import { checkRuleBasedPermissions } from '../../utils/permissions/permissions.js'
 import { formatError } from '../../utils/toolErrors.js'
+import { getAutoFixConfig } from '../autoFix/autoFixConfig.js'
+import { shouldRunAutoFix, buildAutoFixContext } from '../autoFix/autoFixHook.js'
+import { runAutoFixCheck } from '../autoFix/autoFixRunner.js'
 import { isMcpTool } from '../mcp/utils.js'
 import type { McpServerType, MessageUpdateLazy } from './toolExecution.js'
 
@@ -185,6 +188,40 @@ export async function* runPostToolUseHooks<Input extends AnyObject, Output>(
         }
       }
     }
+
+    // Auto-fix: run lint/test if configured for this tool
+    const autoFixSettings = toolUseContext.getAppState().settings
+    const autoFixConfig = getAutoFixConfig(
+      autoFixSettings && typeof autoFixSettings === 'object' && 'autoFix' in autoFixSettings
+        ? (autoFixSettings as Record<string, unknown>).autoFix
+        : undefined,
+    )
+    if (shouldRunAutoFix(tool.name, autoFixConfig) && autoFixConfig) {
+      try {
+        const cwd = toolUseContext.options?.cwd ?? process.cwd()
+        const autoFixResult = await runAutoFixCheck({
+          lint: autoFixConfig.lint,
+          test: autoFixConfig.test,
+          timeout: autoFixConfig.timeout,
+          cwd,
+          signal: toolUseContext.abortController.signal,
+        })
+        const autoFixContext = buildAutoFixContext(autoFixResult)
+        if (autoFixContext) {
+          yield {
+            message: createAttachmentMessage({
+              type: 'hook_additional_context',
+              content: [autoFixContext],
+              hookName: `AutoFix:${tool.name}`,
+              toolUseID,
+              hookEvent: 'PostToolUse',
+            }),
+          }
+        }
+      } catch (autoFixError) {
+        logError(autoFixError)
+      }
+    }
   } catch (error) {
     logError(error)
   }