fix(cli): -c picks the most recently used session

tests/hermes_cli/test_resolve_last_session.py

@@ -0,0 +1,61 @@
+"""Verify `hermes -c` picks the session the user most recently used."""
+
+from __future__ import annotations
+
+from hermes_cli.main import _resolve_last_session
+
+
+class _FakeDB:
+    def __init__(self, rows):
+        self._rows = rows
+        self.closed = False
+
+    def search_sessions(self, source=None, limit=20, **_kw):
+        rows = [r for r in self._rows if r.get("source") == source] if source else list(self._rows)
+        return rows[:limit]
+
+    def close(self):
+        self.closed = True
+
+
+def test_resolve_last_session_prefers_last_active_over_started_at(monkeypatch):
+    # `search_sessions` returns in started_at DESC order, but the most recently
+    # *touched* session may have been started earlier. -c should pick by
+    # last_active so closing the active session and typing `hermes -c` resumes
+    # that one, not an older-but-newer-started session from another window.
+    rows = [
+        {
+            "id": "new_started_old_active",
+            "source": "cli",
+            "started_at": 1000.0,
+            "last_active": 100.0,
+        },
+        {
+            "id": "old_started_recently_active",
+            "source": "cli",
+            "started_at": 500.0,
+            "last_active": 999.0,
+        },
+    ]
+
+    fake_db = _FakeDB(rows)
+    monkeypatch.setattr("hermes_state.SessionDB", lambda: fake_db)
+
+    assert _resolve_last_session("cli") == "old_started_recently_active"
+    assert fake_db.closed
+
+
+def test_resolve_last_session_returns_none_when_empty(monkeypatch):
+    monkeypatch.setattr("hermes_state.SessionDB", lambda: _FakeDB([]))
+    assert _resolve_last_session("cli") is None
+
+
+def test_resolve_last_session_falls_back_to_started_at(monkeypatch):
+    # When last_active is missing entirely (legacy row), fall back to
+    # started_at so the helper still picks the newest session.
+    rows = [
+        {"id": "older", "source": "cli", "started_at": 10.0},
+        {"id": "newer", "source": "cli", "started_at": 20.0},
+    ]
+    monkeypatch.setattr("hermes_state.SessionDB", lambda: _FakeDB(rows))
+    assert _resolve_last_session("cli") == "newer"