fix: Initialize Skills Hub on list

Call ensure_hub_dirs() at the start of hermes skills list so the\nSkills Hub directory structure is created before reading hub\nmetadata.\n\nAdd a regression test covering the empty-home path where\ndoctor recommends running the list command.\n\nRefs: #703

tests/hermes_cli/test_skills_hub.py

@@ -0,0 +1,31 @@
+from io import StringIO
+
+from rich.console import Console
+
+from hermes_cli.skills_hub import do_list
+
+
+def test_do_list_initializes_hub_dir(monkeypatch, tmp_path):
+    import tools.skills_hub as hub
+    import tools.skills_tool as skills_tool
+
+    hub_dir = tmp_path / "skills" / ".hub"
+    monkeypatch.setattr(hub, "SKILLS_DIR", tmp_path / "skills")
+    monkeypatch.setattr(hub, "HUB_DIR", hub_dir)
+    monkeypatch.setattr(hub, "LOCK_FILE", hub_dir / "lock.json")
+    monkeypatch.setattr(hub, "QUARANTINE_DIR", hub_dir / "quarantine")
+    monkeypatch.setattr(hub, "AUDIT_LOG", hub_dir / "audit.log")
+    monkeypatch.setattr(hub, "TAPS_FILE", hub_dir / "taps.json")
+    monkeypatch.setattr(hub, "INDEX_CACHE_DIR", hub_dir / "index-cache")
+    monkeypatch.setattr(skills_tool, "_find_all_skills", lambda: [])
+
+    console = Console(file=StringIO(), force_terminal=False, color_system=None)
+
+    assert not hub_dir.exists()
+
+    do_list(console=console)
+
+    assert hub_dir.exists()
+    assert (hub_dir / "lock.json").exists()
+    assert (hub_dir / "quarantine").is_dir()
+    assert (hub_dir / "index-cache").is_dir()