Translate user-facing runtime output to English, machine prefixes preserved, + CLI output test (#67, #85)

* feat: standardize runtime output in English

* test: cover English CLI output

c/tests/test_cli_output.py

@@ -0,0 +1,49 @@
+import subprocess
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+
+HERE = Path(__file__).resolve().parent.parent
+CLI = HERE / "coli"
+
+
+class CliOutputLanguageTest(unittest.TestCase):
+    def run_cli(self, *args):
+        return subprocess.run(
+            [sys.executable, str(CLI), *args],
+            cwd=HERE,
+            text=True,
+            capture_output=True,
+            check=False,
+            timeout=10,
+        )
+
+    def test_help_is_english(self):
+        result = self.run_cli("--help")
+        self.assertEqual(result.returncode, 0, result.stderr)
+        self.assertIn("run GLM-5.2 locally", result.stdout)
+        self.assertIn("automatically apply the RAM/VRAM plan", result.stdout)
+        self.assertNotIn("modello", result.stdout.lower())
+        self.assertNotIn("motore", result.stdout.lower())
+
+    def test_info_status_is_english(self):
+        with tempfile.TemporaryDirectory() as model:
+            result = self.run_cli("info", "--model", model)
+        self.assertEqual(result.returncode, 0, result.stderr)
+        self.assertIn("config.json is missing", result.stdout)
+        self.assertIn("disk", result.stdout)
+        self.assertIn("engine", result.stdout)
+
+    def test_missing_model_error_is_english(self):
+        with tempfile.TemporaryDirectory() as directory:
+            missing_model = str(Path(directory) / "missing-model")
+            result = self.run_cli("run", "--model", missing_model, "hello")
+        self.assertNotEqual(result.returncode, 0)
+        self.assertIn("model not found", result.stderr)
+        self.assertIn("set COLI_MODEL or use --model", result.stderr)
+
+
+if __name__ == "__main__":
+    unittest.main()