fix(native-chat): prepare SQLite readers for ZCode-only WSL homes

src/main/ai-vault/opencode-wsl-runtime-preparation.test.ts

@@ -263,7 +263,7 @@ describe('WSL SQLite runtime preparation', () => {
     mocks.run.mockResolvedValueOnce(success(''))
     await prepare([home])
     await vi.waitFor(async () =>
-      expect((await prepare([home]))[0]?.error).toContain('No OpenCode database')
+      expect((await prepare([home]))[0]?.error).toContain('No OpenCode or ZCode database')
     )
     expect(mocks.run).toHaveBeenCalledOnce()
     expect(mocks.download).not.toHaveBeenCalled()
@@ -274,16 +274,19 @@ describe('WSL SQLite runtime preparation', () => {
     expect(mocks.running).toHaveBeenCalledWith(expect.any(Array), { requireConfirmed: true })
   })
 
-  it.skipIf(process.platform === 'win32')(
-    'keeps the discovery default visible when guest overrides point elsewhere',
-    async () => {
+  it.skipIf(process.platform === 'win32').each(['opencode', 'zcode'] as const)(
+    'prepares a %s-only distro despite unrelated OpenCode overrides',
+    async (agent) => {
       await prepared()
       const script = mocks.run.mock.calls[0]?.[0].script
       const directory = await mkdtemp(join(tmpdir(), 'orca-wsl-presence-'))
       try {
-        const data = join(directory, '.local', 'share', 'opencode')
+        const data =
+          agent === 'zcode'
+            ? join(directory, '.zcode', 'cli', 'db')
+            : join(directory, '.local', 'share', 'opencode')
         await mkdir(data, { recursive: true })
-        await writeFile(join(data, 'opencode.db'), '')
+        await writeFile(join(data, agent === 'zcode' ? 'db.sqlite' : 'opencode.db'), '')
         const result = await runProcess({
           program: '/bin/sh',
           args: ['-c', script],

src/main/ai-vault/opencode-wsl-runtime-preparation.ts

@@ -113,6 +113,7 @@ async function prepare(distro: string): Promise<OpenCodeWslRuntime> {
   const hasDatabase = await run({
     script: [
       'data="${XDG_DATA_HOME:-$HOME/.local/share}/opencode"',
+      'if [ -f "$HOME/.zcode/cli/db/db.sqlite" ]; then printf present; exit 0; fi',
       // WSL discovery still enumerates the default data root independently of guest overrides.
       'for db in "$HOME/.local/share/opencode"/opencode.db "$HOME/.local/share/opencode"/opencode-*.db; do if [ -f "$db" ]; then printf present; exit 0; fi; done',
       'case "${OPENCODE_DB-}" in',
@@ -125,7 +126,7 @@ async function prepare(distro: string): Promise<OpenCodeWslRuntime> {
     loginPath: 'none'
   })
   if (hasDatabase !== 'present') {
-    return { distro, error: 'No OpenCode database is present in this WSL distro.' }
+    return { distro, error: 'No OpenCode or ZCode database is present in this WSL distro.' }
   }
   const readerPath = await run({
     program: 'wslpath',