chore(tui): keep MRU resume split out of perf PR

- remove the temporary -c MRU logic and companion test from this branch so PR #15926 stays focused on TUI perf work
- keep the resume-ordering change isolated in the dedicated follow-up PR

tests/hermes_cli/test_resolve_last_session.py

@@ -1,101 +0,0 @@
-"""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_search_sessions_exposes_last_active_column(tmp_path, monkeypatch):
-    # End-to-end: the actual SessionDB must surface a last_active column so
-    # _resolve_last_session's sort works. A previous bug had last_active=None
-    # on every row because search_sessions used `SELECT *` with no computed
-    # column, silently breaking the -c resume behavior.
-    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
-    monkeypatch.setattr("pathlib.Path.home", lambda: tmp_path)
-
-    import hermes_state
-
-    from pathlib import Path
-
-    db = hermes_state.SessionDB(db_path=Path(tmp_path / "state.db"))
-    try:
-        db.create_session("s_started_later", source="cli")
-        db.create_session("s_active_later", source="cli")
-        # Force started_at ordering so the test is deterministic regardless
-        # of how quickly the two inserts land.
-        with db._lock:
-            db._conn.execute("UPDATE sessions SET started_at=? WHERE id=?", (2000.0, "s_started_later"))
-            db._conn.execute("UPDATE sessions SET started_at=? WHERE id=?", (1000.0, "s_active_later"))
-            db._conn.commit()
-
-        db.append_message("s_active_later", role="user", content="hi")
-        with db._lock:
-            db._conn.execute(
-                "UPDATE messages SET timestamp=? WHERE session_id=?",
-                (3000.0, "s_active_later"),
-            )
-            db._conn.commit()
-
-        rows = db.search_sessions(source="cli", limit=5)
-        ids = {r["id"]: r.get("last_active") for r in rows}
-
-        assert ids["s_started_later"] == 2000.0
-        assert ids["s_active_later"] == 3000.0
-    finally:
-        db.close()
-
-
-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"