Create safe fleet worktrees

src/kernel/worktree-state.mjs

@@ -0,0 +1,22 @@
+import { execFileSync } from 'node:child_process';
+import { existsSync } from 'node:fs';
+
+function git(root, args) {
+  try {
+    return execFileSync('git', ['-C', root, ...args], {
+      encoding: 'utf8', stdio: ['ignore', 'pipe', 'ignore'],
+    }).trim();
+  } catch { return ''; }
+}
+
+export function inspectManagedWorktree(root, entry, mainBranch) {
+  if (!existsSync(entry.path)) return { ...entry, safeToRemove: false, problems: ['worktree-missing'] };
+  const problems = [];
+  const actualBranch = git(entry.path, ['branch', '--show-current']);
+  if (actualBranch !== entry.branch) problems.push(`branch-mismatch:${actualBranch || 'detached'}`);
+  const status = git(entry.path, ['status', '--porcelain=v1', '--untracked-files=all']);
+  if (status) problems.push('worktree-dirty');
+  const ahead = Number(git(root, ['rev-list', '--count', `${mainBranch}..${entry.branch}`]) || 0);
+  if (ahead > 0) problems.push(`unique-commits:${ahead}`);
+  return { ...entry, actualBranch, ahead, safeToRemove: problems.length === 0, problems };
+}