Add temporary automation scripts for test suite migration

Commit the Python migration script and the shell restoration loop used to batch-process the transition of legacy test Jakefiles to the modern Node toolchain.

These scripts provide an auditable record of the automated transformations applied to the test suite and will be removed in a subsequent commit - once the migration is complete.

Tests/Manual/revert-tests.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env zsh
+
+for dir in */ ; do
+    git checkout -- "$dir"
+    git clean -fd "$dir"
+done

Tests/Manual/wip-migrate-jakefiles.py

@@ -68,6 +68,9 @@ def transform_jakefile(content):
 
 def migrate(apply_changes):
     root_dir = "."
+    candidates = []
+
+    # Pass 1: Gather candidates
     for item in sorted(os.listdir(root_dir)):
         target_dir = os.path.join(root_dir, item)
 
@@ -82,33 +85,35 @@ def migrate(apply_changes):
                 break
 
         if jakefile_path:
-            backup_path = os.path.join(target_dir, "JakefileBackup")
+            candidates.append((target_dir, jakefile_path))
 
-            with open(jakefile_path, "r") as f:
-                original_content = f.read()
+    print(f"Found {len(candidates)} candidate Jakefile(s).")
 
-            transformed_content = transform_jakefile(original_content)
+    if not apply_changes:
+        print("Dry run mode. Use --apply to execute the transformations.")
+        return
 
-            if apply_changes:
-                if not os.path.exists(backup_path):
-                    os.rename(jakefile_path, backup_path)
-                elif jakefile_path != os.path.join(target_dir, "Jakefile"):
-                    os.remove(jakefile_path)
+    # Pass 2: Apply transformations
+    for target_dir, jakefile_path in candidates:
+        with open(jakefile_path, "r") as f:
+            original_content = f.read()
 
-                new_path = os.path.join(target_dir, "Jakefile")
-                with open(new_path, "w") as f:
-                    f.write(transformed_content)
+        transformed_content = transform_jakefile(original_content)
 
-                print(f"Surgically migrated: {target_dir}/Jakefile")
-            else:
-                print(f"Would migrate: {jakefile_path}")
+        new_path = os.path.join(target_dir, "Jakefile")
+
+        # Ensure we don't end up with both 'jakefile' and 'Jakefile' on case-sensitive filesystems
+        if jakefile_path != new_path:
+            os.remove(jakefile_path)
+
+        with open(new_path, "w") as f:
+            f.write(transformed_content)
+
+        print(f'Migrated: "{new_path}"')
 
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description="Surgically modernize subsidiary Jakefiles.")
-    parser.add_argument("--apply", action="store_true", help="Apply the transformations and create backups.")
+    parser = argparse.ArgumentParser(description="Modernize subsidiary Jakefiles.")
+    parser.add_argument("--apply", action="store_true", help="Apply the transformations directly (no backups).")
     args = parser.parse_args()
 
-    if not args.apply:
-        print("Dry run. Use --apply to execute the transformation.")
-
     migrate(args.apply)