init: add source code from src.zip

src/utils/getWorktreePathsPortable.ts

@@ -0,0 +1,27 @@
+import { execFile as execFileCb } from 'child_process'
+import { promisify } from 'util'
+
+const execFileAsync = promisify(execFileCb)
+
+/**
+ * Portable worktree detection using only child_process — no analytics,
+ * no bootstrap deps, no execa. Used by listSessionsImpl.ts (SDK) and
+ * anywhere that needs worktree paths without pulling in the CLI
+ * dependency chain (execa → cross-spawn → which).
+ */
+export async function getWorktreePathsPortable(cwd: string): Promise<string[]> {
+  try {
+    const { stdout } = await execFileAsync(
+      'git',
+      ['worktree', 'list', '--porcelain'],
+      { cwd, timeout: 5000 },
+    )
+    if (!stdout) return []
+    return stdout
+      .split('\n')
+      .filter(line => line.startsWith('worktree '))
+      .map(line => line.slice('worktree '.length).normalize('NFC'))
+  } catch {
+    return []
+  }
+}