diff --git a/src/core/__tests__/capability-plugin-routing-parity.test.ts b/src/core/__tests__/capability-plugin-routing-parity.test.ts
index d06105088..91c010e3f 100644
--- a/src/core/__tests__/capability-plugin-routing-parity.test.ts
+++ b/src/core/__tests__/capability-plugin-routing-parity.test.ts
@@ -29,7 +29,7 @@ import {
 import { deriveCapabilityForPlatform } from '../platform-descriptor/derive.ts';
 import { platformDescriptors } from '../platform-descriptor/registry.ts';
 import { getPlugin } from '../platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from '../platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from '../interactors/register-builtins.ts';
 
 // Phase 3 step (b) parity gate. Independent oracles pin that the migration is
 // byte-for-byte behaviorless:
diff --git a/src/core/capabilities.ts b/src/core/capabilities.ts
index d6947f96c..5b8087d76 100644
--- a/src/core/capabilities.ts
+++ b/src/core/capabilities.ts
@@ -1,7 +1,7 @@
 import { deriveCapabilityMatrix } from './command-descriptor/derive.ts';
 import { commandDescriptors } from './command-descriptor/registry.ts';
 import { tryGetPlugin } from './platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from './platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from './interactors/register-builtins.ts';
 import type { DeviceInfo } from '../kernel/device.ts';
 
 // Populate the PlatformPlugin registry once at module load (idempotent; registers
diff --git a/src/core/command-descriptor/registry.ts b/src/core/command-descriptor/registry.ts
index 2d13436d1..99bdaee49 100644
--- a/src/core/command-descriptor/registry.ts
+++ b/src/core/command-descriptor/registry.ts
@@ -39,8 +39,10 @@ const isShardedTestRequest = (req: DaemonRequest): boolean =>
 // The per-command `supports()` / `unsupportedHint()` device closures that used to
 // live here were RELOCATED VERBATIM onto the owning PlatformPlugin's
 // `capability.supportsByDefault` / `unsupportedHintByDefault` in Phase 3 step b.2
-// (src/core/platform-plugin/register-builtins.ts). The capability facet now carries
-// platform/kind buckets only; admission reads the closure off the plugin.
+// (the Apple family's closures live on the Apple plugin, src/platforms/apple/plugin.ts;
+// android/linux/web plugins are wired in src/core/interactors/register-builtins.ts). The
+// capability facet now carries platform/kind buckets only; admission reads the closure
+// off the plugin.
 // ---------------------------------------------------------------------------
 
 const APPLE_SIM_AND_DEVICE = { simulator: true, device: true };
diff --git a/src/core/interactors.ts b/src/core/interactors.ts
index 77e26f65f..dd23f9a04 100644
--- a/src/core/interactors.ts
+++ b/src/core/interactors.ts
@@ -3,7 +3,7 @@ import { AppError } from '../kernel/errors.ts';
 import { getProviderDeviceInteractor, isActiveProviderDevice } from '../provider-device-runtime.ts';
 import type { Interactor, RunnerContext } from './interactor-types.ts';
 import { getPlugin } from './platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from './platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from './interactors/register-builtins.ts';
 
 // Populate the platform-plugin registry once, at module load (only registers
 // lazy closures — no leaf code is imported here, so CLI cold-start is unaffected).
diff --git a/src/core/interactors/register-builtins.ts b/src/core/interactors/register-builtins.ts
new file mode 100644
index 000000000..d93214c22
--- /dev/null
+++ b/src/core/interactors/register-builtins.ts
@@ -0,0 +1,117 @@
+import { registerPlatformPlugin, type PlatformPlugin } from '../platform-plugin/plugin.ts';
+import { applePlugin } from '../../platforms/apple/plugin.ts';
+import { PUBLIC_COMMANDS } from '../../command-catalog.ts';
+import { isAudioProbeSupportedDevice } from '../../kernel/audio-probe-support.ts';
+import { WEB_DESKTOP_DEVICE } from '../platform-inventory.ts';
+import type { Platform, DeviceInfo } from '../../kernel/device.ts';
+import type { DeviceInventoryRequest } from '../platform-inventory.ts';
+
+// The builtin-plugin wiring lives at the interactor seam (src/core/interactors/) —
+// the one place R3 (see scripts/layering/check.ts) permits a STATIC value import of
+// `platforms/`, so this module can pull the relocated `applePlugin`
+// (src/platforms/apple/plugin.ts) into the registry while the generic registry + type
+// stay in `core/` (src/core/platform-plugin/plugin.ts) where non-interactor core code
+// like `core/capabilities.ts` may import them. The Apple plugin instance and its
+// capability closures now live under `platforms/apple/`; the android/linux/web wiring
+// stays here. Each plugin WRAPS today's existing factories (src/core/interactors/*) and
+// the inventory if-chain (src/core/platform-inventory.ts) as LAZY methods: the dynamic
+// `import()`s and per-platform list calls are byte-for-byte the same as the
+// hand-authored `getInteractor` switch arms and `listLocalDeviceInventory` branches.
+// `as const satisfies PlatformPlugin` preserves each plugin's literal `platforms` tuple
+// so the totality assertion below is a real compile-time check.
+
+const androidPlugin = {
+  id: 'android',
+  platforms: ['android'],
+  capability: {
+    bucket: 'android',
+    supportsByDefault: { [PUBLIC_COMMANDS.audio]: isAudioProbeSupportedDevice },
+  },
+  // Wraps the Android arm of `resolveLogBackend`: every Android device -> 'android'.
+  appLog: { resolveBackend: () => 'android' },
+  // Wraps the Android arm of `supportsPlatformPerfMetrics`: every Android device
+  // reports perf-metrics support.
+  perf: { supportsMetrics: () => true },
+  createInteractor: async (device: DeviceInfo) => {
+    const { createAndroidInteractor } = await import('./android.ts');
+    return createAndroidInteractor(device);
+  },
+  discoverDevices: async (request: DeviceInventoryRequest) => {
+    const { listAndroidDevices } = await import('../../platforms/android/devices.ts');
+    return await listAndroidDevices({
+      serialAllowlist: request.androidSerialAllowlist
+        ? new Set(request.androidSerialAllowlist)
+        : undefined,
+    });
+  },
+} as const satisfies PlatformPlugin;
+
+const linuxPlugin = {
+  id: 'linux',
+  platforms: ['linux'],
+  capability: { bucket: 'linux' },
+  createInteractor: async () => {
+    const { createLinuxInteractor } = await import('./linux.ts');
+    return createLinuxInteractor();
+  },
+  discoverDevices: async () => {
+    const { listLinuxDevices } = await import('../../platforms/linux/devices.ts');
+    return await listLinuxDevices();
+  },
+} as const satisfies PlatformPlugin;
+
+const webPlugin = {
+  id: 'web',
+  platforms: ['web'],
+  capability: { bucket: 'web' },
+  createInteractor: async () => {
+    const { createWebInteractor } = await import('./web.ts');
+    return createWebInteractor();
+  },
+  // Mirrors the `request.platform === 'web'` branch (the single static device).
+  discoverDevices: async () => [WEB_DESKTOP_DEVICE],
+} as const satisfies PlatformPlugin;
+
+/**
+ * The builtin plugins, in `PLATFORMS` order so `registeredPlatforms()` derives
+ * the canonical tuple's order (asserted by the parity test).
+ */
+export const BUILTIN_PLATFORM_PLUGINS = [
+  applePlugin,
+  androidPlugin,
+  linuxPlugin,
+  webPlugin,
+] as const satisfies readonly PlatformPlugin[];
+
+// The leaf platforms covered by at least one builtin plugin, recovered from the
+// preserved literal `platforms` tuples.
+type CoveredPlatform = (typeof BUILTIN_PLATFORM_PLUGINS)[number]['platforms'][number];
+
+/**
+ * Compile-time EXHAUSTIVENESS: a new `Platform` literal added to `PLATFORMS`
+ * without a plugin makes `Platform` no longer extend `CoveredPlatform`, so this
+ * alias resolves to `false`, violating the `extends true` constraint and failing
+ * the build. This is the registry counterpart of the deleted `getInteractor`
+ * switch's exhaustive `never` default. (Equivalent in spirit to the §5.1
+ * `Object.fromEntries(registeredPlatforms()...) satisfies Record<Platform, true>`
+ * sketch, but type-level so it cannot be satisfied vacuously by a runtime map.)
+ */
+type AssertTrue<T extends true> = T;
+export type BuiltinPluginsCoverAllPlatforms = AssertTrue<
+  [Platform] extends [CoveredPlatform] ? true : false
+>;
+
+let registered = false;
+
+/**
+ * Registers every builtin plugin into the shared registry exactly once
+ * (idempotent). Called at the top of `core/interactors.ts` so the registry is
+ * populated before any `getPlugin` lookup; safe to call again from tests.
+ */
+export function registerBuiltinPlatformPlugins(): void {
+  if (registered) return;
+  for (const plugin of BUILTIN_PLATFORM_PLUGINS) {
+    registerPlatformPlugin(plugin);
+  }
+  registered = true;
+}
diff --git a/src/core/platform-plugin/__tests__/apple-os-capability-table-parity.test.ts b/src/core/platform-plugin/__tests__/apple-os-capability-table-parity.test.ts
index 8b80f359c..dfbf14cec 100644
--- a/src/core/platform-plugin/__tests__/apple-os-capability-table-parity.test.ts
+++ b/src/core/platform-plugin/__tests__/apple-os-capability-table-parity.test.ts
@@ -23,7 +23,7 @@ import {
 } from '../../../__tests__/test-utils/index.ts';
 import { APPLE_OS_CAPABILITIES, resolveDeviceAppleOs } from '../apple-os-capabilities.ts';
 import { getPlugin } from '../plugin.ts';
-import { registerBuiltinPlatformPlugins } from '../register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from '../../interactors/register-builtins.ts';
 
 // Phase 3 step d.5 table-equivalence gate. The AppleOS-axis predicates
 // (`target !== 'tv'` / `platform !== 'macos'` / `isTvOsDevice`) that used to be
diff --git a/src/core/platform-plugin/__tests__/parity.test.ts b/src/core/platform-plugin/__tests__/parity.test.ts
index 96bb26e79..42d0c79c0 100644
--- a/src/core/platform-plugin/__tests__/parity.test.ts
+++ b/src/core/platform-plugin/__tests__/parity.test.ts
@@ -4,7 +4,10 @@ import { PLATFORMS, type Platform } from '../../../kernel/device.ts';
 import { AppError } from '../../../kernel/errors.ts';
 import { platformDescriptors } from '../../platform-descriptor/registry.ts';
 import { getPlugin, registeredPlatforms, registerPlatformPlugin, tryGetPlugin } from '../plugin.ts';
-import { BUILTIN_PLATFORM_PLUGINS, registerBuiltinPlatformPlugins } from '../register-builtins.ts';
+import {
+  BUILTIN_PLATFORM_PLUGINS,
+  registerBuiltinPlatformPlugins,
+} from '../../interactors/register-builtins.ts';
 
 // Idempotently populate the registry for this test module.
 registerBuiltinPlatformPlugins();
diff --git a/src/daemon/__tests__/applog-plugin-routing-parity.test.ts b/src/daemon/__tests__/applog-plugin-routing-parity.test.ts
index 5802b7476..41791e42b 100644
--- a/src/daemon/__tests__/applog-plugin-routing-parity.test.ts
+++ b/src/daemon/__tests__/applog-plugin-routing-parity.test.ts
@@ -18,7 +18,7 @@ import {
   WEB_DESKTOP_DEVICE,
 } from '../../__tests__/test-utils/index.ts';
 import { getPlugin } from '../../core/platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from '../../core/platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from '../../core/interactors/register-builtins.ts';
 import { resolveLogBackend } from '../app-log.ts';
 import type { LogBackend } from '../network-log.ts';
 
diff --git a/src/daemon/__tests__/perf-plugin-routing-parity.test.ts b/src/daemon/__tests__/perf-plugin-routing-parity.test.ts
index 734203afe..17b258f81 100644
--- a/src/daemon/__tests__/perf-plugin-routing-parity.test.ts
+++ b/src/daemon/__tests__/perf-plugin-routing-parity.test.ts
@@ -19,7 +19,7 @@ import {
   WEB_DESKTOP_DEVICE,
 } from '../../__tests__/test-utils/index.ts';
 import { getPlugin } from '../../core/platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from '../../core/platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from '../../core/interactors/register-builtins.ts';
 import { buildPerfResponseData } from '../handlers/session-perf.ts';
 import { PERF_UNAVAILABLE_REASON } from '../handlers/session-startup-metrics.ts';
 
diff --git a/src/daemon/app-log.ts b/src/daemon/app-log.ts
index 6d30f1d48..a62d928a0 100644
--- a/src/daemon/app-log.ts
+++ b/src/daemon/app-log.ts
@@ -3,7 +3,7 @@ import path from 'node:path';
 import type { DeviceInfo } from '../kernel/device.ts';
 import { AppError } from '../kernel/errors.ts';
 import { tryGetPlugin } from '../core/platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from '../core/platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from '../core/interactors/register-builtins.ts';
 import { runCmd } from '../utils/exec.ts';
 import { runXcrun } from '../platforms/apple/core/tool-provider.ts';
 import { runAndroidAdb } from '../platforms/android/adb.ts';
diff --git a/src/daemon/handlers/session-perf.ts b/src/daemon/handlers/session-perf.ts
index 8813f375a..4f12532df 100644
--- a/src/daemon/handlers/session-perf.ts
+++ b/src/daemon/handlers/session-perf.ts
@@ -3,7 +3,7 @@ import type { SessionAction, SessionState } from '../types.ts';
 import { AppError, normalizeError } from '../../kernel/errors.ts';
 import { isApplePlatform } from '../../kernel/device.ts';
 import { tryGetPlugin } from '../../core/platform-plugin/plugin.ts';
-import { registerBuiltinPlatformPlugins } from '../../core/platform-plugin/register-builtins.ts';
+import { registerBuiltinPlatformPlugins } from '../../core/interactors/register-builtins.ts';
 import type { AndroidAdbExecutor } from '../../platforms/android/adb-executor.ts';
 import {
   ANDROID_HPROF_SNAPSHOT_DESCRIPTION,
diff --git a/src/core/interactors/__tests__/apple-watchos-sentinel.test.ts b/src/platforms/apple/__tests__/watchos-sentinel.test.ts
similarity index 93%
rename from src/core/interactors/__tests__/apple-watchos-sentinel.test.ts
rename to src/platforms/apple/__tests__/watchos-sentinel.test.ts
index 32279566b..6a70705ca 100644
--- a/src/core/interactors/__tests__/apple-watchos-sentinel.test.ts
+++ b/src/platforms/apple/__tests__/watchos-sentinel.test.ts
@@ -1,7 +1,7 @@
 import { test, expect } from 'vitest';
-import { createAppleInteractor } from '../apple.ts';
+import { createAppleInteractor } from '../interactor.ts';
 import type { DeviceInfo } from '../../../kernel/device.ts';
-import type { RunnerContext } from '../../interactor-types.ts';
+import type { RunnerContext } from '../../../core/interactor-types.ts';
 import { AppError } from '../../../kernel/errors.ts';
 
 // watchOS is an explicit unsupported sentinel: XCUITest cannot drive watchOS UI,
diff --git a/src/platforms/apple/core/__tests__/index.test.ts b/src/platforms/apple/core/__tests__/index.test.ts
index fccd51e93..61c35830a 100644
--- a/src/platforms/apple/core/__tests__/index.test.ts
+++ b/src/platforms/apple/core/__tests__/index.test.ts
@@ -76,7 +76,7 @@ import {
   prepareSimulatorStatusBarForScreenshot as prepareStatusBarForScreenshot,
 } from '../screenshot-status-bar.ts';
 import { runAppleRunnerCommand } from '../runner/runner-client.ts';
-import { iosRunnerOverrides } from '../../../ios/interactions.ts';
+import { iosRunnerOverrides } from '../../interactions.ts';
 import { IOS_DEVICE_INSTALL_TIMEOUT_MS, IOS_SIMULATOR_TERMINATE_TIMEOUT_MS } from '../config.ts';
 import type { DeviceInfo } from '../../../../kernel/device.ts';
 import { withDiagnosticsScope } from '../../../../utils/diagnostics.ts';
diff --git a/src/platforms/ios/interactions.ts b/src/platforms/apple/interactions.ts
similarity index 96%
rename from src/platforms/ios/interactions.ts
rename to src/platforms/apple/interactions.ts
index 9744f9692..8d2a9f63b 100644
--- a/src/platforms/ios/interactions.ts
+++ b/src/platforms/apple/interactions.ts
@@ -1,20 +1,20 @@
 import { isTvOsDevice, type DeviceInfo } from '../../kernel/device.ts';
 import { assertScrollGestureInput, type ScrollDirection } from '../../core/scroll-gesture.ts';
 import { normalizeScrollDurationMs, SCROLL_DURATION_MAX_MS } from '../../core/scroll-command.ts';
-import { runAppleRunnerCommand } from '../apple/core/runner/runner-client.ts';
+import { runAppleRunnerCommand } from './core/runner/runner-client.ts';
 import {
   buildRunnerSequenceCommand,
   parseRunnerSequenceResult,
-} from '../apple/core/runner/runner-sequence.ts';
-import type { RunnerCommand } from '../apple/core/runner/runner-contract.ts';
-import { appleRemotePressCommand } from '../apple/os/tvos/remote.ts';
-import { runMacosDesktopScroll } from '../apple/os/macos/desktop-scroll.ts';
+} from './core/runner/runner-sequence.ts';
+import type { RunnerCommand } from './core/runner/runner-contract.ts';
+import { appleRemotePressCommand } from './os/tvos/remote.ts';
+import { runMacosDesktopScroll } from './os/macos/desktop-scroll.ts';
 import {
   normalizeAppleScrollResult,
   normalizeAppleScrollResultWithResolvedFrame,
   scrollRunnerFields,
   type AppleScrollOptions,
-} from '../apple/core/scroll.ts';
+} from './core/scroll.ts';
 import type {
   BackMode,
   Interactor,
diff --git a/src/core/interactors/apple.ts b/src/platforms/apple/interactor.ts
similarity index 92%
rename from src/core/interactors/apple.ts
rename to src/platforms/apple/interactor.ts
index 294d3ef05..165b8f382 100644
--- a/src/core/interactors/apple.ts
+++ b/src/platforms/apple/interactor.ts
@@ -6,19 +6,16 @@ import {
   screenshotIos,
   setIosSetting,
   writeIosClipboardText,
-} from '../../platforms/apple/core/apps.ts';
-import {
-  iosRunnerOverrides,
-  resolveAppleBackRunnerCommand,
-} from '../../platforms/ios/interactions.ts';
-import { appleRemotePressCommand } from '../../platforms/apple/os/tvos/remote.ts';
-import { runMacOsScreenshotAction } from '../../platforms/apple/os/macos/helper.ts';
-import { runAppleRunnerCommand } from '../../platforms/apple/core/runner/runner-client.ts';
+} from './core/apps.ts';
+import { iosRunnerOverrides, resolveAppleBackRunnerCommand } from './interactions.ts';
+import { appleRemotePressCommand } from './os/tvos/remote.ts';
+import { runMacOsScreenshotAction } from './os/macos/helper.ts';
+import { runAppleRunnerCommand } from './core/runner/runner-client.ts';
 import { withDiagnosticTimer } from '../../utils/diagnostics.ts';
 import { isTvOsDevice, type DeviceInfo } from '../../kernel/device.ts';
 import { AppError } from '../../kernel/errors.ts';
 import type { RawSnapshotNode } from '../../kernel/snapshot.ts';
-import type { Interactor, RunnerContext } from '../interactor-types.ts';
+import type { Interactor, RunnerContext } from '../../core/interactor-types.ts';
 import {
   readSnapshotQualityVerdict,
   type SnapshotQualityVerdict,
diff --git a/src/core/platform-plugin/register-builtins.ts b/src/platforms/apple/plugin.ts
similarity index 58%
rename from src/core/platform-plugin/register-builtins.ts
rename to src/platforms/apple/plugin.ts
index 7da4d20fb..54645aedf 100644
--- a/src/core/platform-plugin/register-builtins.ts
+++ b/src/platforms/apple/plugin.ts
@@ -1,11 +1,11 @@
-import { appleOsCapabilities } from './apple-os-capabilities.ts';
-import { registerPlatformPlugin, type PlatformPlugin } from './plugin.ts';
+import { appleOsCapabilities } from '../../core/platform-plugin/apple-os-capabilities.ts';
+import type { PlatformPlugin } from '../../core/platform-plugin/plugin.ts';
 import { PUBLIC_COMMANDS } from '../../command-catalog.ts';
 import { isAudioProbeSupportedDevice } from '../../kernel/audio-probe-support.ts';
-import { shouldUseHostMacFastPath, WEB_DESKTOP_DEVICE } from '../platform-inventory.ts';
-import type { Platform, DeviceInfo } from '../../kernel/device.ts';
-import type { DeviceInventoryRequest } from '../platform-inventory.ts';
-import type { RunnerContext } from '../interactor-types.ts';
+import { shouldUseHostMacFastPath } from '../../core/platform-inventory.ts';
+import type { DeviceInfo } from '../../kernel/device.ts';
+import type { DeviceInventoryRequest } from '../../core/platform-inventory.ts';
+import type { RunnerContext } from '../../core/interactor-types.ts';
 
 // ---------------------------------------------------------------------------
 // Apple family per-command capability closures. Originally RELOCATED VERBATIM from
@@ -108,15 +108,15 @@ const APPLE_UNSUPPORTED_HINT_BY_DEFAULT: Record<
   'transform-gesture': synthesisGestureUnsupportedHint,
 };
 
-// Each plugin WRAPS today's existing factories (src/core/interactors/*) and the
-// inventory if-chain (src/core/platform-inventory.ts) as LAZY methods. No leaf
-// code is rewritten: the dynamic `import()`s and the per-platform list calls are
-// byte-for-byte the same as the hand-authored `getInteractor` switch arms and
-// `listLocalDeviceInventory` branches. `as const satisfies PlatformPlugin`
-// preserves each plugin's literal `platforms` tuple so the totality assertion
-// below is a real compile-time check.
+// The Apple plugin WRAPS today's existing factories (its `createInteractor` in
+// `./interactor.ts`) and the inventory if-chain (src/core/platform-inventory.ts) as
+// LAZY methods. No leaf code is rewritten: the dynamic `import()`s and the per-platform
+// list calls are byte-for-byte the same as the hand-authored `getInteractor` switch arm
+// and `listLocalDeviceInventory` branch. `as const satisfies PlatformPlugin` preserves
+// the plugin's literal `platforms` tuple so the registry totality assertion (in
+// `core/interactors/register-builtins.ts`) is a real compile-time check.
 
-const applePlugin = {
+export const applePlugin = {
   id: 'apple',
   // Apple owns BOTH leaf platforms today — mirrors `case 'ios': case 'macos':`.
   platforms: ['ios', 'macos'],
@@ -140,116 +140,20 @@ const applePlugin = {
   // (ios/macos, any kind/target) reports perf-metrics support.
   perf: { supportsMetrics: () => true },
   createInteractor: async (device: DeviceInfo, runner: RunnerContext) => {
-    const { createAppleInteractor } = await import('../interactors/apple.ts');
+    const { createAppleInteractor } = await import('./interactor.ts');
     return createAppleInteractor(device, runner);
   },
   // Reproduces the macOS host fast-path + Apple-simulator branch of the
   // inventory if-chain, reusing the SAME predicate (no divergent copy).
   discoverDevices: async (request: DeviceInventoryRequest) => {
     if (shouldUseHostMacFastPath(request)) {
-      const { listMacosDevices } = await import('../../platforms/apple/os/macos/devices.ts');
+      const { listMacosDevices } = await import('./os/macos/devices.ts');
       return await listMacosDevices();
     }
-    const { listAppleDevices } = await import('../../platforms/apple/core/devices.ts');
+    const { listAppleDevices } = await import('./core/devices.ts');
     return await listAppleDevices({
       simulatorSetPath: request.iosSimulatorSetPath,
       udid: request.udid,
     });
   },
 } as const satisfies PlatformPlugin;
-
-const androidPlugin = {
-  id: 'android',
-  platforms: ['android'],
-  capability: {
-    bucket: 'android',
-    supportsByDefault: { [PUBLIC_COMMANDS.audio]: isAudioProbeSupportedDevice },
-  },
-  // Wraps the Android arm of `resolveLogBackend`: every Android device -> 'android'.
-  appLog: { resolveBackend: () => 'android' },
-  // Wraps the Android arm of `supportsPlatformPerfMetrics`: every Android device
-  // reports perf-metrics support.
-  perf: { supportsMetrics: () => true },
-  createInteractor: async (device: DeviceInfo) => {
-    const { createAndroidInteractor } = await import('../interactors/android.ts');
-    return createAndroidInteractor(device);
-  },
-  discoverDevices: async (request: DeviceInventoryRequest) => {
-    const { listAndroidDevices } = await import('../../platforms/android/devices.ts');
-    return await listAndroidDevices({
-      serialAllowlist: request.androidSerialAllowlist
-        ? new Set(request.androidSerialAllowlist)
-        : undefined,
-    });
-  },
-} as const satisfies PlatformPlugin;
-
-const linuxPlugin = {
-  id: 'linux',
-  platforms: ['linux'],
-  capability: { bucket: 'linux' },
-  createInteractor: async () => {
-    const { createLinuxInteractor } = await import('../interactors/linux.ts');
-    return createLinuxInteractor();
-  },
-  discoverDevices: async () => {
-    const { listLinuxDevices } = await import('../../platforms/linux/devices.ts');
-    return await listLinuxDevices();
-  },
-} as const satisfies PlatformPlugin;
-
-const webPlugin = {
-  id: 'web',
-  platforms: ['web'],
-  capability: { bucket: 'web' },
-  createInteractor: async () => {
-    const { createWebInteractor } = await import('../interactors/web.ts');
-    return createWebInteractor();
-  },
-  // Mirrors the `request.platform === 'web'` branch (the single static device).
-  discoverDevices: async () => [WEB_DESKTOP_DEVICE],
-} as const satisfies PlatformPlugin;
-
-/**
- * The builtin plugins, in `PLATFORMS` order so `registeredPlatforms()` derives
- * the canonical tuple's order (asserted by the parity test).
- */
-export const BUILTIN_PLATFORM_PLUGINS = [
-  applePlugin,
-  androidPlugin,
-  linuxPlugin,
-  webPlugin,
-] as const satisfies readonly PlatformPlugin[];
-
-// The leaf platforms covered by at least one builtin plugin, recovered from the
-// preserved literal `platforms` tuples.
-type CoveredPlatform = (typeof BUILTIN_PLATFORM_PLUGINS)[number]['platforms'][number];
-
-/**
- * Compile-time EXHAUSTIVENESS: a new `Platform` literal added to `PLATFORMS`
- * without a plugin makes `Platform` no longer extend `CoveredPlatform`, so this
- * alias resolves to `false`, violating the `extends true` constraint and failing
- * the build. This is the registry counterpart of the deleted `getInteractor`
- * switch's exhaustive `never` default. (Equivalent in spirit to the §5.1
- * `Object.fromEntries(registeredPlatforms()...) satisfies Record<Platform, true>`
- * sketch, but type-level so it cannot be satisfied vacuously by a runtime map.)
- */
-type AssertTrue<T extends true> = T;
-export type BuiltinPluginsCoverAllPlatforms = AssertTrue<
-  [Platform] extends [CoveredPlatform] ? true : false
->;
-
-let registered = false;
-
-/**
- * Registers every builtin plugin into the shared registry exactly once
- * (idempotent). Called at the top of `core/interactors.ts` so the registry is
- * populated before any `getPlugin` lookup; safe to call again from tests.
- */
-export function registerBuiltinPlatformPlugins(): void {
-  if (registered) return;
-  for (const plugin of BUILTIN_PLATFORM_PLUGINS) {
-    registerPlatformPlugin(plugin);
-  }
-  registered = true;
-}
diff --git a/src/sdk/index.ts b/src/sdk/index.ts
index ab79afe95..13cdbf39f 100644
--- a/src/sdk/index.ts
+++ b/src/sdk/index.ts
@@ -2,134 +2,3 @@ export { createAgentDeviceClient } from '../client/client.ts';
 export { createLocalArtifactAdapter } from '../io.ts';
 export { AppError, isAgentDeviceError, normalizeAgentDeviceError } from '../kernel/errors.ts';
 export { centerOfRect } from '../kernel/snapshot.ts';
-
-export type {
-  ArtifactAdapter,
-  ArtifactDescriptor,
-  CreateTempFileOptions,
-  FileInputRef,
-  FileOutputRef,
-  LocalArtifactAdapterOptions,
-  OutputVisibility,
-  ReserveOutputOptions,
-  ReservedOutputFile,
-  ResolveInputOptions,
-  ResolvedInputFile,
-  TemporaryFile,
-} from './io.ts';
-
-export type { AppErrorCode, NormalizedError } from '../kernel/errors.ts';
-
-export type {
-  ReplayTestReporter,
-  ReplayTestReporterContext,
-  ReplayTestReporterFactory,
-  ReplayTestReporterLoadContext,
-} from '../replay/test/reporters/types.ts';
-
-export type { CommandResult } from '../core/command-descriptor/command-result.ts';
-export type { ResponseLevel } from '../kernel/contracts.ts';
-export type { BootCommandResult, ShutdownCommandResult } from '../contracts/device.ts';
-export type { ViewportCommandResult } from '../contracts/viewport.ts';
-export type {
-  CloudArtifact,
-  CloudArtifactAvailability,
-  CloudArtifactKind,
-  CloudArtifactsResult,
-  CloudArtifactsStatus,
-} from '../cloud-artifacts.ts';
-
-export type {
-  AgentDeviceClient,
-  AgentDeviceClientConfig,
-  AgentDeviceCommandClient,
-  AgentDeviceDaemonTransport,
-  AgentDeviceDevice,
-  AgentDeviceIdentifiers,
-  AgentDeviceRequestOverrides,
-  AgentDeviceSelectionOptions,
-  AgentDeviceSession,
-  AgentDeviceSessionDevice,
-  AlertAction,
-  AlertCommandOptions,
-  AlertInfo,
-  AlertPlatform,
-  AlertSource,
-  AppCloseOptions,
-  AppCloseResult,
-  AppDeployOptions,
-  AppDeployResult,
-  AppInstallFromSourceOptions,
-  AppInstallFromSourceResult,
-  AppListOptions,
-  AppOpenOptions,
-  AppOpenResult,
-  AppPushOptions,
-  AppStateCommandOptions,
-  AppStateCommandResult,
-  AppSwitcherCommandOptions,
-  AppSwitcherCommandResult,
-  AppTriggerEventOptions,
-  BackCommandOptions,
-  BackCommandResult,
-  BatchRunOptions,
-  BatchRunResult,
-  BatchStep,
-  CaptureDiffOptions,
-  CaptureScreenshotOptions,
-  CaptureScreenshotResult,
-  CaptureSnapshotOptions,
-  CaptureSnapshotResult,
-  ClickOptions,
-  ClipboardCommandOptions,
-  ClipboardCommandResult,
-  CloudArtifactsOptions,
-  CommandRequestResult,
-  DeviceBootOptions,
-  DeviceShutdownOptions,
-  ElementTarget,
-  FillOptions,
-  FindLocator,
-  FindOptions,
-  FocusOptions,
-  GetOptions,
-  HomeCommandResult,
-  InteractionTarget,
-  IsOptions,
-  KeyboardCommandOptions,
-  KeyboardCommandResult,
-  LogsOptions,
-  LongPressOptions,
-  MaterializationReleaseOptions,
-  MaterializationReleaseResult,
-  MetroPrepareOptions,
-  MetroPrepareResult,
-  NetworkOptions,
-  PerfOptions,
-  PermissionTarget,
-  PinchOptions,
-  PressOptions,
-  RecordOptions,
-  ReplayRunOptions,
-  ReplayTestOptions,
-  RotateCommandOptions,
-  RotateCommandResult,
-  ScrollOptions,
-  SessionCloseResult,
-  SettingsUpdateOptions,
-  StartupPerfSample,
-  SwipeOptions,
-  TargetShutdownResult,
-  TraceOptions,
-  TypeTextOptions,
-  WaitCommandOptions,
-} from '../client/client.ts';
-
-export type {
-  Point,
-  Rect,
-  ScreenshotOverlayRef,
-  SnapshotNode,
-  SnapshotVisibility,
-  SnapshotVisibilityReason,
-} from '../kernel/snapshot.ts';
diff --git a/src/utils/__tests__/interactors.test.ts b/src/utils/__tests__/interactors.test.ts
index e3ff2acf4..a26f148e5 100644
--- a/src/utils/__tests__/interactors.test.ts
+++ b/src/utils/__tests__/interactors.test.ts
@@ -11,7 +11,7 @@ vi.mock('../../platforms/apple/core/runner/runner-client.ts', async (importOrigi
 });
 
 import { getInteractor } from '../../core/interactors.ts';
-import { resolveAppleBackRunnerCommand } from '../../platforms/ios/interactions.ts';
+import { resolveAppleBackRunnerCommand } from '../../platforms/apple/interactions.ts';
 import { runAppleRunnerCommand } from '../../platforms/apple/core/runner/runner-client.ts';
 
 const iosSimulator: DeviceInfo = {
diff --git a/test/integration/installed-package-metro.test.ts b/test/integration/installed-package-metro.test.ts
index 3209fd334..c01f3acc8 100644
--- a/test/integration/installed-package-metro.test.ts
+++ b/test/integration/installed-package-metro.test.ts
@@ -270,11 +270,11 @@ test('installed package exposes Node APIs and packaged companion tunnel entrypoi
       consumerRoot,
       ['--input-type=module', '-e'],
       `
-        import { createAgentDeviceClient, createLocalArtifactAdapter } from 'agent-device';
+        import * as agentDeviceRoot from 'agent-device';
         import 'agent-device/contracts';
         import { createLocalArtifactAdapter as createIoArtifactAdapter } from 'agent-device/io';
         import { buildBundleUrl, normalizeBaseUrl } from 'agent-device/metro';
-        const client = createAgentDeviceClient();
+        const client = agentDeviceRoot.createAgentDeviceClient();
         const removedSubpaths = await Promise.all([
           'agent-device/backend',
           'agent-device/commands',
@@ -290,8 +290,11 @@ test('installed package exposes Node APIs and packaged companion tunnel entrypoi
         }));
         console.log(JSON.stringify({
           bundleUrl: buildBundleUrl('https://public.example.test', 'ios'),
+          rootExports: Object.keys(agentDeviceRoot).sort(),
           rootClientSnapshot: typeof client.capture.snapshot,
-          rootArtifactAdapter: typeof createLocalArtifactAdapter({ cwd: process.cwd() }).reserveOutput,
+          rootArtifactAdapter: typeof agentDeviceRoot.createLocalArtifactAdapter({
+            cwd: process.cwd(),
+          }).reserveOutput,
           ioArtifactAdapter: typeof createIoArtifactAdapter({ cwd: process.cwd() }).reserveOutput,
           removedSubpathsBlocked: removedSubpaths.every(Boolean),
           normalizedBaseUrl: normalizeBaseUrl('https://public.example.test///'),
@@ -303,6 +306,14 @@ test('installed package exposes Node APIs and packaged companion tunnel entrypoi
       imports.bundleUrl,
       'https://public.example.test/index.bundle?platform=ios&dev=true&minify=false',
     );
+    assert.deepEqual(imports.rootExports, [
+      'AppError',
+      'centerOfRect',
+      'createAgentDeviceClient',
+      'createLocalArtifactAdapter',
+      'isAgentDeviceError',
+      'normalizeAgentDeviceError',
+    ]);
     assert.equal(imports.rootClientSnapshot, 'function');
     assert.equal(imports.rootArtifactAdapter, 'function');
     assert.equal(imports.ioArtifactAdapter, 'function');