chore: import upstream snapshot with attribution

scripts/check_classifiers.py

@@ -0,0 +1,48 @@
+import re
+import sys
+import urllib.request
+from pathlib import Path
+
+# This script checks the classifiers in a pyproject.toml file against the official Trove classifier list.
+# If the classifiers are invalid, PyPI will reject the package upload.
+
+# Step 1: Get pyproject.toml path from args
+if len(sys.argv) != 2:
+    print(f"Usage: {sys.argv[0]} path/to/pyproject.toml", file=sys.stderr)
+    sys.exit(1)
+
+pyproject_path = Path(sys.argv[1])
+if not pyproject_path.is_file():
+    print(f"File not found: {pyproject_path}", file=sys.stderr)
+    sys.exit(1)
+
+# Step 1: Download the official Trove classifier list
+url = "https://pypi.org/pypi?%3Aaction=list_classifiers"
+with urllib.request.urlopen(url) as response:
+    trove_classifiers = {line.decode("utf-8").strip() for line in response}
+
+# Step 2: Extract classifiers from pyproject.toml
+with open(pyproject_path) as f:
+    content = f.read()
+
+match = re.search(r"classifiers\s*=\s*\[([^\]]*)\]", content, re.MULTILINE | re.DOTALL)
+if not match:
+    print("No 'classifiers' block found in pyproject.toml", file=sys.stderr)
+    sys.exit(1)
+
+raw_block = match.group(1)
+classifiers = [c.strip(" \"'\n") for c in raw_block.split(",") if c.strip()]
+
+# Step 3: Check for invalid classifiers
+invalid = [c for c in classifiers if c not in trove_classifiers]
+
+if invalid:
+    print("❌ Invalid classifiers:")
+    for c in invalid:
+        print(f"  - {c}")
+    print("Valid classifiers:")
+    for c in sorted(trove_classifiers):
+        print(f"  - {c}")
+    sys.exit(1)
+else:
+    print("✅ All classifiers are valid.")