Migrate to vitest: setup + leaf modules

[thymikee]

Step 1 of 4: Drop test-only DI with vitest module mocking

Add vitest alongside node:test. Migrate leaf modules that have no downstream consumers of their DI params.

Setup

• Add vitest as dev dependency
• Configure vitest.config.ts (coexist with node:test during migration)
• Update CI to run both runners

Files to migrate (15 DI params removed)

src/daemon/recording-telemetry.ts (1 param)

• Remove writeTelemetry?: typeof writeRecordingTelemetry
• Rewrite test with vi.mock

src/daemon/handlers/find.ts (1 param)

• Remove dispatch?: typeof dispatchCommand
• Rewrite __tests__/find.test.ts with vi.mock('../../core/dispatch.ts')

src/daemon/handlers/install-source.ts (7 params)

• Remove deps object: resolveInstallDevice?, getRequestSignal?, prepareIosInstallArtifact?, installIosInstallablePath?, prepareAndroidInstallArtifact?, installAndroidInstallablePathAndResolvePackageName?, inferAndroidAppName?
• Rewrite __tests__/install-source.test.ts with vi.mock for each platform import

src/daemon/handlers/session-runtime-command.ts (1 param)

• Remove clearRuntimeHints?: typeof clearRuntimeHintsFromApp
• Rewrite relevant test with vi.mock('../runtime-hints.ts')

src/daemon/android-system-dialog.ts (4 params)

• Remove snapshotAndroidUi?, reopenAndroidApp?, readAndroidAppState?, execCommand?
• Rewrite __tests__/request-router-android-modal.test.ts with vi.mock

src/daemon/handlers/interaction-snapshot.ts (1 param)

• Remove dispatch: typeof dispatchCommand = dispatchCommand default-value DI
• Mock dispatch in calling test

Validation

• pnpm typecheck
• pnpm test:unit (node:test suite still passes)
• vitest suite passes for migrated files
• No optional typeof params remain in touched files

CI lint guard

Add to CI: rg '\?\s*:\s*typeof\s+' <touched files> must return zero matches.

Part of migration: #1→#2→#3→#4