asdf

Squash the current repository state back into one baseline commit while
preserving the README reframing and repository contents.

Constraint: User explicitly requested a single squashed commit with subject "asdf"
Confidence: high
Scope-risk: broad
Reversibility: clean
Directive: This commit intentionally rewrites published history; coordinate before future force-pushes
Tested: git status clean; local history rewritten to one commit; force-pushed main to origin and instructkr
Not-tested: Fresh clone verification after push

src/utils/getWorktreePaths.ts

@@ -0,0 +1,70 @@
+import { sep } from 'path'
+import { logEvent } from '../services/analytics/index.js'
+import { execFileNoThrowWithCwd } from './execFileNoThrow.js'
+import { gitExe } from './git.js'
+
+/**
+ * Returns the paths of all worktrees for the current git repository.
+ * If git is not available, not in a git repo, or only has one worktree,
+ * returns an empty array.
+ *
+ * This version includes analytics tracking and uses the CLI's gitExe()
+ * resolver. For a portable version without CLI deps, use
+ * getWorktreePathsPortable().
+ *
+ * @param cwd Directory to run the command from
+ * @returns Array of absolute worktree paths
+ */
+export async function getWorktreePaths(cwd: string): Promise<string[]> {
+  const startTime = Date.now()
+
+  const { stdout, code } = await execFileNoThrowWithCwd(
+    gitExe(),
+    ['worktree', 'list', '--porcelain'],
+    {
+      cwd,
+      preserveOutputOnError: false,
+    },
+  )
+
+  const durationMs = Date.now() - startTime
+
+  if (code !== 0) {
+    logEvent('tengu_worktree_detection', {
+      duration_ms: durationMs,
+      worktree_count: 0,
+      success: false,
+    })
+    return []
+  }
+
+  // Parse porcelain output - lines starting with "worktree " contain paths
+  // Example:
+  // worktree /Users/foo/repo
+  // HEAD abc123
+  // branch refs/heads/main
+  //
+  // worktree /Users/foo/repo-wt1
+  // HEAD def456
+  // branch refs/heads/feature
+  const worktreePaths = stdout
+    .split('\n')
+    .filter(line => line.startsWith('worktree '))
+    .map(line => line.slice('worktree '.length).normalize('NFC'))
+
+  logEvent('tengu_worktree_detection', {
+    duration_ms: durationMs,
+    worktree_count: worktreePaths.length,
+    success: true,
+  })
+
+  // Sort worktrees: current worktree first, then alphabetically
+  const currentWorktree = worktreePaths.find(
+    path => cwd === path || cwd.startsWith(path + sep),
+  )
+  const otherWorktrees = worktreePaths
+    .filter(path => path !== currentWorktree)
+    .sort((a, b) => a.localeCompare(b))
+
+  return currentWorktree ? [currentWorktree, ...otherWorktrees] : otherWorktrees
+}