test(host): scenarios name their own host env; the harness no longer forwards the process's Swift cache

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: thymikee

test/integration/provider-scenarios/android-recording-fixtures.ts

@@ -25,7 +25,7 @@ export async function stopAndroidRecording(
  * The daemon's host for an Android recording scenario: no real tool on its PATH, so the Swift
  * helpers cannot compile, and a Swift cache of its own.
  */
-export function androidRecordingHostEnv(tmpDir: string): Readonly<Record<string, string>> {
+function androidRecordingHostEnv(tmpDir: string): Readonly<Record<string, string>> {
   return { PATH: tmpDir, AGENT_DEVICE_SWIFT_CACHE_DIR: path.join(tmpDir, 'swift-cache') };
 }
 

test/integration/provider-scenarios/harness.ts

@@ -111,8 +111,6 @@ export async function createProviderScenarioHarness(
     PATH: process.env.PATH,
     HOME: process.env.HOME,
     TMPDIR: process.env.TMPDIR,
-    // A scenario that isolates the Swift helper cache names it through the process.
-    AGENT_DEVICE_SWIFT_CACHE_DIR: process.env.AGENT_DEVICE_SWIFT_CACHE_DIR,
     // A scenario that seeds claims for its daemon names the directory through the process.
     AGENT_DEVICE_CLAIMS_DIR: process.env.AGENT_DEVICE_CLAIMS_DIR ?? path.join(testRoot, 'claims'),
     AGENT_DEVICE_DAEMON_IDLE_TIMEOUT_MS: '3600000',

test/integration/provider-scenarios/ios-record-trace.test.ts

@@ -111,11 +111,6 @@ test('iOS simulator recording reports host contention and recovers through the f
         appleSimulatorScreenRecordingTransport: () => recordingTransport,
         deviceInventoryProvider: async () => [PROVIDER_SCENARIO_IOS_SIMULATOR],
       });
-      const previousPath = process.env.PATH;
-      const previousSwiftCacheDir = process.env.AGENT_DEVICE_SWIFT_CACHE_DIR;
-      process.env.PATH = tmpDir;
-      process.env.AGENT_DEVICE_SWIFT_CACHE_DIR = path.join(tmpDir, 'swift-cache');
-
       try {
         const open = await daemon.callCommand('open', ['com.apple.Preferences'], {
           platform: 'ios',

test/integration/provider-scenarios/macos-world.ts

@@ -48,7 +48,10 @@ export async function createMacOsDesktopWorld(
       },
     },
   });
+  // Recording finalization runs the Swift validator; the process's warm cache keeps it from compiling.
+  const swiftCacheDir = process.env.AGENT_DEVICE_SWIFT_CACHE_DIR;
   const daemon = await createProviderScenarioHarness({
+    ...(swiftCacheDir ? { env: { AGENT_DEVICE_SWIFT_CACHE_DIR: swiftCacheDir } } : {}),
     appleRunnerProvider: options.appleRunnerProvider
       ? () => options.appleRunnerProvider
       : undefined,