feat(skiff): align CLI with Vercel skills and fix entry symlink

Replace install/uninstall with add/remove, add publish for git ops in
~/.skills, and resolve bin/skiff symlinks so commands work from any cwd.

Co-authored-by: Cursor <cursoragent@cursor.com>

skiff/gitops.py

@@ -0,0 +1,59 @@
+"""~/.skills 仓库内的 git 操作。"""
+
+from __future__ import annotations
+
+import subprocess
+import sys
+from pathlib import Path
+
+from skiff.paths import SKILLS_HOME
+
+
+def _run_git(repo: Path, *args: str, check: bool = True) -> subprocess.CompletedProcess[str]:
+    return subprocess.run(
+        ["git", "-C", str(repo), *args],
+        check=check,
+        text=True,
+        capture_output=not sys.stdout.isatty(),
+    )
+
+
+def ensure_git_repo(repo: Path) -> None:
+    if not (repo / ".git").exists():
+        raise SystemExit(f"不是 git 仓库: {repo}")
+
+
+def has_staged_changes(repo: Path) -> bool:
+    result = _run_git(repo, "diff", "--cached", "--quiet", check=False)
+    return result.returncode == 1
+
+
+def publish(
+    *,
+    paths: list[str],
+    message: str | None,
+    push: bool,
+    no_commit: bool,
+) -> None:
+    repo = SKILLS_HOME.resolve()
+    ensure_git_repo(repo)
+
+    _run_git(repo, "add", "--", *paths)
+
+    if not has_staged_changes(repo):
+        print("没有可提交的变更", file=sys.stdout)
+        return
+
+    if no_commit:
+        print(f"已暂存变更: {', '.join(paths)}", file=sys.stdout)
+        return
+
+    if not message:
+        raise SystemExit("提交需要 -m/--message")
+
+    _run_git(repo, "commit", "-m", message)
+    print(f"已提交: {message}", file=sys.stdout)
+
+    if push:
+        _run_git(repo, "push")
+        print("已推送到远程", file=sys.stdout)