Add contributor guide and project usage docs

tests/test_config.py

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+"""Config 테스트."""
+
+from lazy_enter.config import Config
+
+
+def test_config_defaults():
+    config = Config()
+    assert config.default_shell == "claude"
+    assert config.pty_read_timeout == 5
+    assert config.output_buffer_interval == 2.0
+    assert config.max_message_length == 3000

tests/test_hooks.py

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+"""hooks 모듈 테스트."""
+
+from lazy_enter.hooks import format_notification, parse_hook_event
+
+
+def test_parse_hook_event_valid():
+    raw = '{"type": "prompt", "tool": "Bash"}'
+    event = parse_hook_event(raw)
+    assert event["type"] == "prompt"
+    assert event["tool"] == "Bash"
+
+
+def test_parse_hook_event_invalid():
+    event = parse_hook_event("not json")
+    assert event == {}
+
+
+def test_format_notification_prompt():
+    event = {"type": "prompt", "tool": "Bash"}
+    msg = format_notification(event)
+    assert msg is not None
+    assert "승인 대기 중" in msg
+
+
+def test_format_notification_completion():
+    event = {"type": "completion", "summary": "리팩토링 완료"}
+    msg = format_notification(event)
+    assert msg is not None
+    assert "완료" in msg
+
+
+def test_format_notification_unknown():
+    event = {"type": "unknown"}
+    assert format_notification(event) is None

tests/test_pty_manager.py

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+"""PtyManager 테스트."""
+
+from lazy_enter.pty_manager import PtyManager
+
+
+def test_initial_state():
+    pty = PtyManager("echo hello")
+    assert not pty.is_alive
+
+
+def test_start_and_stop():
+    pty = PtyManager("cat")
+    pty.start()
+    assert pty.is_alive
+    pty.stop()
+    assert not pty.is_alive