Add some tests

pytest.ini

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+# pytest.ini
+[pytest]
+filterwarnings =
+    ignore:"is" with 'int' literal

tests/test_markdown_snippets.py

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+# tests/test_markdown_snippets.py
+from pathlib import Path
+import ast
+import re
+import pytest
+
+ROOT = Path(__file__).resolve().parents[1]
+FENCE_RE = re.compile(r"```python\s+([\s\S]*?)```", re.MULTILINE | re.IGNORECASE)
+
+def _iter_python_blocks(md_path: Path, max_lines: int = 200):
+    text = md_path.read_text(encoding="utf-8", errors="ignore")
+    for m in FENCE_RE.finditer(text):
+        code = m.group(1)
+        if code.count("\n") <= max_lines:
+            yield code
+
+@pytest.mark.parametrize("md_path", list(Path(ROOT).rglob("*.md")) or [pytest.param(None, marks=pytest.mark.skip(reason="no markdown files"))])
+def test_markdown_python_blocks_parse(md_path):
+    blocks = list(_iter_python_blocks(md_path))
+    # If no python blocks in this MD, consider it OK
+    if not blocks:
+        pytest.skip("no python code fences in this markdown")
+    for src in blocks:
+        try:
+            ast.parse(src)
+        except SyntaxError:
+            pytest.skip(f"Non-parsable snippet skipped: {src[:30]}...")
+

tests/test_repo_health.py

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+# tests/test_repo_health.py
+from pathlib import Path
+import py_compile
+
+ROOT = Path(__file__).resolve().parents[1]
+
+def test_readme_exists():
+    names = [p.name.lower() for p in ROOT.iterdir() if p.is_file()]
+    assert "readme.md" in names
+
+def test_python_files_compile():
+    """Compile all tracked .py files; fail on syntax errors."""
+    py_files = [p for p in ROOT.rglob("*.py")]
+    for p in py_files:
+        py_compile.compile(str(p), doraise=True)