refactor(main): add runtime domain registry and fan-in guardrails

Introduce runtime domain barrel exports and registry composition support, and document/check main runtime fan-in workflow with related backlog planning artifacts.

src/main/runtime/domains/anilist.ts

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+export * from '../anilist-media-guess';
+export * from '../anilist-media-guess-main-deps';
+export * from '../anilist-media-state';
+export * from '../anilist-media-state-main-deps';
+export * from '../anilist-post-watch';
+export * from '../anilist-post-watch-main-deps';
+export * from '../anilist-setup';
+export * from '../anilist-setup-protocol';
+export * from '../anilist-setup-protocol-main-deps';
+export * from '../anilist-setup-window';
+export * from '../anilist-setup-window-main-deps';
+export * from '../anilist-state';
+export * from '../anilist-token-refresh';
+export * from '../anilist-token-refresh-main-deps';
+export * from '../protocol-url-handlers';
+export * from '../protocol-url-handlers-main-deps';

src/main/runtime/domains/index.ts

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+export * as anilist from './anilist';
+export * as jellyfin from './jellyfin';
+export * as ipc from './ipc';
+export * as mining from './mining';
+export * as mpv from './mpv';
+export * as overlay from './overlay';
+export * as shortcuts from './shortcuts';
+export * as startup from './startup';

src/main/runtime/domains/ipc.ts

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+export * from '../cli-command-context-factory';
+export * from '../cli-command-runtime-handler';
+export * from '../initial-args-runtime-handler';
+export * from '../ipc-mpv-command-main-deps';
+export * from '../ipc-runtime-handlers';

src/main/runtime/domains/jellyfin.ts

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+export * from '../jellyfin-cli-auth';
+export * from '../jellyfin-cli-list';
+export * from '../jellyfin-cli-main-deps';
+export * from '../jellyfin-cli-play';
+export * from '../jellyfin-cli-remote-announce';
+export * from '../jellyfin-client-info';
+export * from '../jellyfin-client-info-main-deps';
+export * from '../jellyfin-command-dispatch';
+export * from '../jellyfin-command-dispatch-main-deps';
+export * from '../jellyfin-playback-launch';
+export * from '../jellyfin-playback-launch-main-deps';
+export * from '../jellyfin-remote-commands';
+export * from '../jellyfin-remote-connection';
+export * from '../jellyfin-remote-connection-main-deps';
+export * from '../jellyfin-remote-main-deps';
+export * from '../jellyfin-remote-playback';
+export * from '../jellyfin-remote-session-lifecycle';
+export * from '../jellyfin-remote-session-main-deps';
+export * from '../jellyfin-setup-window';
+export * from '../jellyfin-setup-window-main-deps';
+export * from '../jellyfin-subtitle-preload';
+export * from '../jellyfin-subtitle-preload-main-deps';
+export * from '../mpv-jellyfin-defaults';
+export * from '../mpv-jellyfin-defaults-main-deps';

src/main/runtime/domains/mining.ts

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+export * from '../anki-actions';
+export * from '../anki-actions-main-deps';
+export * from '../mining-actions';
+export * from '../mining-actions-main-deps';

src/main/runtime/domains/mpv.ts

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+export * from '../mpv-client-runtime-service';
+export * from '../mpv-client-runtime-service-main-deps';
+export * from '../mpv-main-event-bindings';
+export * from '../mpv-main-event-main-deps';
+export * from '../mpv-osd-runtime-handlers';
+export * from '../mpv-subtitle-render-metrics';
+export * from '../mpv-subtitle-render-metrics-main-deps';
+export * from '../secondary-sub-mode-runtime-handler';
+export * from '../subtitle-tokenization-main-deps';

src/main/runtime/domains/overlay.ts

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+export * from '../config-hot-reload-handlers';
+export * from '../config-hot-reload-main-deps';
+export * from '../field-grouping-overlay-main-deps';
+export * from '../field-grouping-resolver';
+export * from '../field-grouping-resolver-main-deps';
+export * from '../overlay-bootstrap-main-deps';
+export * from '../overlay-main-actions';
+export * from '../overlay-main-actions-main-deps';
+export * from '../overlay-runtime-bootstrap-handlers';
+export * from '../overlay-runtime-main-actions';
+export * from '../overlay-runtime-main-actions-main-deps';
+export * from '../overlay-visibility-runtime';
+export * from '../overlay-visibility-runtime-main-deps';
+export * from '../overlay-window-layout';
+export * from '../overlay-window-layout-main-deps';
+export * from '../overlay-window-runtime-handlers';
+export * from '../subtitle-position';
+export * from '../subtitle-position-main-deps';
+export * from '../tray-runtime';
+export * from '../tray-runtime-handlers';
+export * from '../yomitan-extension-runtime';
+export * from '../yomitan-settings-runtime';

src/main/runtime/domains/shortcuts.ts

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+export * from '../global-shortcuts-runtime-handlers';
+export * from '../numeric-shortcut-runtime-main-deps';
+export * from '../numeric-shortcut-session-runtime-handlers';
+export * from '../overlay-shortcuts-runtime-handlers';
+export * from '../overlay-shortcuts-runtime-main-deps';

src/main/runtime/domains/startup.ts

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+export * from '../app-lifecycle-actions';
+export * from '../app-lifecycle-main-activate';
+export * from '../app-lifecycle-main-cleanup';
+export * from '../app-ready-main-deps';
+export * from '../clipboard-queue';
+export * from '../config-derived';
+export * from '../dictionary-runtime-main-deps';
+export * from '../immersion-media';
+export * from '../immersion-startup';
+export * from '../immersion-startup-main-deps';
+export * from '../media-runtime-main-deps';
+export * from '../runtime-bootstrap-main-deps';
+export * from '../startup-config';
+export * from '../startup-config-main-deps';
+export * from '../startup-runtime-handlers';
+export * from '../startup-warmups';
+export * from '../startup-warmups-main-deps';
+export * from '../subtitle-processing-main-deps';
+export * from '../subsync-runtime';

src/main/runtime/registry.test.ts

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+async function loadRegistryOrSkip(t: test.TestContext) {
+  try {
+    return await import('./registry');
+  } catch (error) {
+    if (error instanceof Error && error.message.includes('node:sqlite')) {
+      t.skip('registry import requires node:sqlite support in this runtime');
+      return null;
+    }
+    throw error;
+  }
+}
+
+test('createMainRuntimeRegistry exposes expected runtime domains', async (t) => {
+  const loaded = await loadRegistryOrSkip(t);
+  if (!loaded) return;
+  const { createMainRuntimeRegistry } = loaded;
+  const registry = createMainRuntimeRegistry();
+
+  assert.ok(registry.anilist);
+  assert.ok(registry.jellyfin);
+  assert.ok(registry.overlay);
+  assert.ok(registry.startup);
+  assert.ok(registry.mpv);
+  assert.ok(registry.shortcuts);
+  assert.ok(registry.ipc);
+  assert.ok(registry.mining);
+});
+
+test('registry domains expose representative factories', async (t) => {
+  const loaded = await loadRegistryOrSkip(t);
+  if (!loaded) return;
+  const { createMainRuntimeRegistry } = loaded;
+  const registry = createMainRuntimeRegistry();
+
+  assert.equal(typeof registry.anilist.createNotifyAnilistSetupHandler, 'function');
+  assert.equal(typeof registry.jellyfin.createRunJellyfinCommandHandler, 'function');
+  assert.equal(typeof registry.overlay.createOverlayVisibilityRuntime, 'function');
+  assert.equal(typeof registry.startup.createStartupRuntimeHandlers, 'function');
+  assert.equal(typeof registry.mpv.createMpvClientRuntimeServiceFactory, 'function');
+  assert.equal(typeof registry.shortcuts.createGlobalShortcutsRuntimeHandlers, 'function');
+  assert.equal(typeof registry.ipc.createIpcRuntimeHandlers, 'function');
+  assert.equal(typeof registry.mining.createMineSentenceCardHandler, 'function');
+});

src/main/runtime/registry.ts

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+import * as domains from './domains';
+
+export type MainRuntimeRegistry = typeof domains;
+
+export function createMainRuntimeRegistry(): MainRuntimeRegistry {
+  return domains;
+}