Add hqt palette CLI subcommand (fzf tool launcher)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_cli.py

@@ -63,3 +63,47 @@ def test_tool_cmd_reports_service_error(monkeypatch, tmp_path):
 
     assert result.exit_code == 1
     assert "not an hqt session window" in result.output
+
+
+def test_palette_cmd_shows_popup_for_session_window(monkeypatch, tmp_path):
+    monkeypatch.setattr(
+        "hqt.config.get_settings", lambda: Settings(db_path=tmp_path / "t.db")
+    )
+    monkeypatch.setattr(
+        "hqt.sessions.service.SessionService.session_id_for_window",
+        lambda self, window: 5,
+    )
+    runs = []
+    monkeypatch.setattr(cli.subprocess, "run", lambda argv, **kw: runs.append(argv))
+
+    result = CliRunner().invoke(cli.main, ["palette", "hqt-5"])
+
+    assert result.exit_code == 0, result.output
+    assert len(runs) == 1
+    argv = runs[0]
+    assert "display-popup" in argv
+    popup_cmd = argv[-1]
+    assert "fzf" in popup_cmd
+    assert "nvim" in popup_cmd and "clone" in popup_cmd
+    # the window is baked into the command for `hqt tool {} <window>`
+    assert "hqt-5" in popup_cmd
+
+
+def test_palette_cmd_hints_for_non_session_window(monkeypatch, tmp_path):
+    monkeypatch.setattr(
+        "hqt.config.get_settings", lambda: Settings(db_path=tmp_path / "t.db")
+    )
+    monkeypatch.setattr(
+        "hqt.sessions.service.SessionService.session_id_for_window",
+        lambda self, window: None,
+    )
+    runs = []
+    monkeypatch.setattr(cli.subprocess, "run", lambda argv, **kw: runs.append(argv))
+
+    result = CliRunner().invoke(cli.main, ["palette", "nvim"])
+
+    assert result.exit_code == 0, result.output
+    assert len(runs) == 1
+    argv = runs[0]
+    assert "display-message" in argv
+    assert "display-popup" not in argv