add init command

cli/test/test_init.py

@@ -0,0 +1,59 @@
+from click.testing import CliRunner
+
+from planoai.init_cmd import init
+
+
+def test_init_clean_writes_empty_config(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+
+    runner = CliRunner()
+    result = runner.invoke(init, ["--clean"])
+
+    assert result.exit_code == 0, result.output
+    config_path = tmp_path / "config.yaml"
+    assert config_path.exists()
+    assert config_path.read_text(encoding="utf-8") == "\n"
+
+
+def test_init_template_builtin_writes_config_and_env(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+
+    runner = CliRunner()
+    result = runner.invoke(
+        init, ["--template", "use_cases/claude_code_router", "--yes"]
+    )
+
+    assert result.exit_code == 0, result.output
+
+    config_path = tmp_path / "config.yaml"
+    assert config_path.exists()
+    config_text = config_path.read_text(encoding="utf-8")
+    assert "llm_providers:" in config_text
+
+    env_path = tmp_path / ".env"
+    assert env_path.exists()
+    env_text = env_path.read_text(encoding="utf-8")
+    assert "OPENAI_API_KEY=" in env_text
+    assert "ANTHROPIC_API_KEY=" in env_text
+
+
+def test_init_refuses_overwrite_without_force(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    (tmp_path / "config.yaml").write_text("hello", encoding="utf-8")
+
+    runner = CliRunner()
+    result = runner.invoke(init, ["--clean"])
+
+    assert result.exit_code != 0
+    assert "Refusing to overwrite" in result.output
+
+
+def test_init_force_overwrites(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    (tmp_path / "config.yaml").write_text("hello", encoding="utf-8")
+
+    runner = CliRunner()
+    result = runner.invoke(init, ["--clean", "--force"])
+
+    assert result.exit_code == 0, result.output
+    assert (tmp_path / "config.yaml").read_text(encoding="utf-8") == "\n"