Move conformance tests to per-version directories

Conformance tests now live in conformance/<version>/*.py and are checked
against the corresponding stubs in dist/<version>/. Auto-detection only
runs versions that have both stubs and test files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

main.py

@@ -397,7 +397,11 @@ def typecheck_stubs(versions: list[str] | None = None) -> None:
 
 
 def conformance_check(versions: list[str] | None = None) -> None:
-    """Type-check conformance test files against generated stubs."""
+    """Type-check conformance test files against generated stubs.
+
+    Each version's tests live in conformance/<version>/*.py and are checked
+    against the corresponding generated stubs in dist/<version>/.
+    """
     dist_dir = SCRIPT_DIR / "dist"
     conformance_dir = SCRIPT_DIR / "conformance"
 
@@ -406,24 +410,29 @@ def conformance_check(versions: list[str] | None = None) -> None:
         sys.exit(1)
 
     if versions:
-        missing = [v for v in versions if not (dist_dir / v).is_dir()]
-        if missing:
-            print(f"Missing stubs for: {', '.join(missing)}")
+        missing_stubs = [v for v in versions if not (dist_dir / v).is_dir()]
+        if missing_stubs:
+            print(f"Missing stubs for: {', '.join(missing_stubs)}")
+            sys.exit(1)
+        missing_tests = [v for v in versions if not (conformance_dir / v).is_dir()]
+        if missing_tests:
+            print(f"No conformance tests for: {', '.join(missing_tests)}")
             sys.exit(1)
     else:
         versions = sorted(
             d.name
-            for d in dist_dir.iterdir()
-            if d.is_dir() and not d.name.startswith(".")
+            for d in conformance_dir.iterdir()
+            if d.is_dir() and (dist_dir / d.name).is_dir()
         )
 
     if not versions:
-        print("No generated stubs found in dist/.")
+        print("No conformance test directories found.")
         sys.exit(1)
 
     failed = False
     for version in versions:
         version_dir = dist_dir / version
+        test_dir = conformance_dir / version
         print(f"=== Conformance check against Blender {version} stubs ===")
 
         python_version_file = version_dir / ".python-version"
@@ -437,7 +446,7 @@ def conformance_check(versions: list[str] | None = None) -> None:
         config.write_text(
             json.dumps(
                 {
-                    "include": [str(conformance_dir)],
+                    "include": [str(test_dir)],
                     "extraPaths": [str(version_dir)],
                     "typeCheckingMode": "strict",
                     "pythonVersion": python_version,