Add tool registry for tool windows

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

src/hqt/tools.py

@@ -0,0 +1,28 @@
+"""Tools that can be opened in their own tmux window for a session's project.
+
+A tool window is NOT an hqt session: hqt spawns and styles it, then forgets it.
+It lives purely as a tmux window until the tool exits. (``clone`` is handled
+separately in the service — it creates a real session, not an aux window.)
+"""
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class Tool:
+    """How to open a tool in its own window.
+
+    ``label`` is the base ``@hqt_label`` text (the project name is appended per
+    spawn). ``command`` is the argv to run; an empty list means "use tmux's
+    default shell" (a plain interactive shell).
+    """
+
+    label: str
+    command: list[str]
+
+
+TOOLS: dict[str, Tool] = {
+    "nvim": Tool(label="nvim", command=["nvim"]),
+    "lazygit": Tool(label="lazygit", command=["lazygit"]),
+    "shell": Tool(label="shell", command=[]),
+}

tests/test_tools.py

@@ -0,0 +1,24 @@
+from hqt.tools import TOOLS, Tool
+
+
+def test_registry_has_the_three_tools():
+    assert set(TOOLS) == {"nvim", "lazygit", "shell"}
+
+
+def test_each_entry_is_a_tool():
+    assert all(isinstance(t, Tool) for t in TOOLS.values())
+
+
+def test_nvim_and_lazygit_have_commands():
+    assert TOOLS["nvim"].command == ["nvim"]
+    assert TOOLS["lazygit"].command == ["lazygit"]
+
+
+def test_shell_has_empty_command_meaning_default_shell():
+    assert TOOLS["shell"].command == []
+
+
+def test_labels_are_the_bare_tool_names():
+    assert TOOLS["nvim"].label == "nvim"
+    assert TOOLS["lazygit"].label == "lazygit"
+    assert TOOLS["shell"].label == "shell"