fix(ai-vault-search): satisfy the preload bridge and Windows-lane teardown ratchets after rebase

main now requires concrete return types on every bridge key and refuses raw
recursive rm in tests that run on the Windows package job.

src/main/ai-vault-search/session-search-fts5-contract.test.ts

@@ -1,7 +1,8 @@
-import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { mkdtemp, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { removeTree } from '../../shared/windows-transient-lock-removal'
 import type SyncDatabase from '../sqlite/sync-database'
 import { resetSessionParseCacheForTests } from '../ai-vault/session-scanner-parse-cache'
 import { registerSessionSearchIndexSink } from '../ai-vault/session-search-capture'
@@ -23,7 +24,7 @@ beforeEach(() => {
 
 afterEach(async () => {
   registerSessionSearchIndexSink(null)
-  await Promise.all(tempRoots.map((root) => rm(root, { recursive: true, force: true })))
+  await Promise.all(tempRoots.map((root) => removeTree(root)))
   tempRoots = []
 })
 

src/main/ai-vault-search/session-search-schema.test.ts

@@ -1,7 +1,8 @@
-import { mkdtemp, rm, stat, writeFile } from 'node:fs/promises'
+import { mkdtemp, stat, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { afterEach, describe, expect, it } from 'vitest'
+import { removeTree } from '../../shared/windows-transient-lock-removal'
 import type SyncDatabase from '../sqlite/sync-database'
 import {
   SESSION_SEARCH_SCHEMA_VERSION,
@@ -12,7 +13,7 @@ import {
 let roots: string[] = []
 
 afterEach(async () => {
-  await Promise.all(roots.map((root) => rm(root, { recursive: true, force: true })))
+  await Promise.all(roots.map((root) => removeTree(root)))
   roots = []
 })
 

src/preload/api/ai-vault-bridge.ts

@@ -11,15 +11,20 @@ import type {
 import type { AiVaultSessionTitlesArgs } from '../../shared/ai-vault-session-title'
 import type { AiVaultPrepareSessionResumeArgs } from '../../shared/ai-vault-resume-preparation'
 import type { PreloadApi } from '../api-types'
-import type { AiVaultSearchArgs } from '../../shared/ai-vault-search-types'
+import type {
+  AiVaultSearchArgs,
+  AiVaultSearchCoverage,
+  AiVaultSearchResult
+} from '../../shared/ai-vault-search-types'
 
 export const aiVaultApi = {
   listSessions: (args?: AiVaultListArgs) => ipcRenderer.invoke('aiVault:listSessions', args),
   resolveSessionTitles: (args: AiVaultSessionTitlesArgs) =>
     ipcRenderer.invoke('aiVault:resolveSessionTitles', args),
-  searchSessions: (args: AiVaultSearchArgs): Promise<unknown> =>
+  searchSessions: (args: AiVaultSearchArgs): Promise<AiVaultSearchResult> =>
     ipcRenderer.invoke('aiVault:searchSessions', args),
-  searchCoverage: (): Promise<unknown> => ipcRenderer.invoke('aiVault:searchCoverage'),
+  searchCoverage: (): Promise<AiVaultSearchCoverage> =>
+    ipcRenderer.invoke('aiVault:searchCoverage'),
   cancelListSessions: (args: { requestToken: string }): Promise<void> =>
     ipcRenderer.invoke('aiVault:cancelListSessions', args),
   prepareSessionResume: (args: AiVaultPrepareSessionResumeArgs) =>