experiment: add opt-in projected conservative explosion

tests/validation/taylor_green/run_case.py

@@ -1,4 +1,4 @@
-"""One bounded GPU case. No production edits, plots, checkpoints or field dumps."""
+"""One bounded GPU case, with explicit opt-in experimental explosion."""
 
 import argparse
 import hashlib
@@ -75,7 +75,10 @@ def main():
     p.add_argument("--n", type=int, choices=[32, 64, 128, 256], required=True)
     p.add_argument("--depth", type=int, choices=[1, 2, 3], required=True)
     p.add_argument("--output", type=Path, required=True)
+    p.add_argument("--explosion", choices=["constant", "projected_linear"], default="constant")
     args = p.parse_args()
+    if args.explosion != "constant" and args.depth != 2:
+        p.error("projected_linear requires depth 2")
     if not os.environ.get("CUDA_VISIBLE_DEVICES"):
         p.error("Explicit physical CUDA_VISIBLE_DEVICES selection required")
     repo = args.repo.resolve()
@@ -99,6 +102,8 @@ def main():
     report = dict(
         schema=1,
         source=provenance(repo),
+        historical_baseline_revision="9805383f9c50d867e8555471baf5dbda8333a652",
+        explosion=args.explosion,
         n=args.n,
         re_L=args.re,
         depth=args.depth,
@@ -132,6 +137,7 @@ def main():
                 coarse_boundary="periodic",
                 refinements=refinements,
                 level_blocks=[(8, 8)] * args.depth,
+                explosion=args.explosion,
             )
         with run:
             run.initialize(