fix(xiaohongshu): switch from Docker MCP to xhs-cli (pipx install) (#236)

Docker + Cookie import → `pipx install xiaohongshu-cli` + `xhs login`.
Tier downgraded from 2 to 1. xhs-cli (1,477 stars) auto-extracts
cookies from browser, supports search/read/comment/post/hot/feed.

- xiaohongshu.py: check() detects `xhs` binary, parses `xhs status`
- cli.py: install via pipx instead of Docker
- skill/references/social.md: updated XHS commands
- tests: 3 new tests for CLI-based check()
- 77 tests passing

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_channels.py

@@ -649,19 +649,32 @@ class TestXueqiuChannel:
 
 
 class TestXiaoHongShuChannel:
-    def test_reports_ok_when_server_health_is_ok(self, monkeypatch):
-        monkeypatch.setattr(shutil, "which", lambda _: "/opt/homebrew/bin/mcporter")
+    def test_reports_ok_when_cli_authenticated(self, monkeypatch):
+        monkeypatch.setattr(shutil, "which", lambda _: "/usr/local/bin/xhs")
 
         def fake_run(cmd, **kwargs):
-            if cmd[:4] == ["/opt/homebrew/bin/mcporter", "config", "get", "xiaohongshu"]:
-                return subprocess.CompletedProcess(cmd, 0, '{"name":"xiaohongshu"}', "")
-            if cmd[:4] == ["/opt/homebrew/bin/mcporter", "list", "xiaohongshu", "--json"]:
-                return subprocess.CompletedProcess(cmd, 0, '{"status": "ok"}', "")
-            raise AssertionError(f"unexpected command: {cmd}")
+            return subprocess.CompletedProcess(cmd, 0, "ok: true\nusername: testuser\n", "")
 
         monkeypatch.setattr(subprocess, "run", fake_run)
 
-        assert XiaoHongShuChannel().check() == (
-            "ok",
-            "MCP 已连接（阅读、搜索、发帖、评论、点赞）",
-        )
+        status, msg = XiaoHongShuChannel().check()
+        assert status == "ok"
+        assert "完整可用" in msg
+
+    def test_reports_warn_when_not_authenticated(self, monkeypatch):
+        monkeypatch.setattr(shutil, "which", lambda _: "/usr/local/bin/xhs")
+
+        def fake_run(cmd, **kwargs):
+            return subprocess.CompletedProcess(cmd, 1, "", "ok: false\nerror:\n  code: not_authenticated\n")
+
+        monkeypatch.setattr(subprocess, "run", fake_run)
+
+        status, msg = XiaoHongShuChannel().check()
+        assert status == "warn"
+        assert "xhs login" in msg
+
+    def test_reports_off_when_not_installed(self, monkeypatch):
+        monkeypatch.setattr(shutil, "which", lambda _: None)
+        status, msg = XiaoHongShuChannel().check()
+        assert status == "off"
+        assert "xiaohongshu-cli" in msg