Implement corpus indexing and MCP search

tests/test_cli.py

@@ -0,0 +1,42 @@
+import subprocess
+import sys
+from pathlib import Path
+
+from corpus_mcp.cli import main
+from corpus_mcp.database import read_corpus_info
+
+
+def test_index_command_accepts_description_file(tmp_path: Path, capsys) -> None:
+    source = tmp_path / "source"
+    source.mkdir()
+    (source / "document.txt").write_text("searchable", encoding="utf-8")
+    description = tmp_path / "description.txt"
+    description.write_text("CLI corpus", encoding="utf-8")
+    database = tmp_path / "corpus.sqlite"
+
+    result = main(
+        [
+            "index",
+            str(source),
+            "--database",
+            str(database),
+            "--description-file",
+            str(description),
+        ]
+    )
+
+    assert result == 0
+    assert "Indexed 1 documents" in capsys.readouterr().out
+    assert read_corpus_info(database)["description"] == "CLI corpus"
+
+
+def test_module_help_smoke_test() -> None:
+    result = subprocess.run(
+        [sys.executable, "-m", "corpus_mcp", "--help"],
+        check=False,
+        capture_output=True,
+        text=True,
+    )
+
+    assert result.returncode == 0
+    assert "corpus-mcp" in result.stdout