Merge pull request #11532 from horizon-rust/fix/11520-harness-plain-run

🤖 Agent: dropping the --reference-only assertion makes a plain run go through runner.main()'s full Java/native comparison, and then the strict tags/pot report, so CI now compares instead of exiting in 0 s. mob_discard's default --resources is lab.RESOURCES (the prepared 26.3 folder) and it gets the missing import os. The two sound harnesses take main's #11555 version.

tools/test_loaded_pig_tags_parity.py

@@ -1,8 +1,9 @@
 #!/usr/bin/env python3
 """Actual pig Tags load/save/mutation proof; complete raw list order is diagnostic.
 
-Admit fresh Java with --reference-only --work-dir REF. Reuse exact REF bytes for
-both normal binaries with --reference-dir REF --binary GAME --work-dir NEW_OUT.
+A plain run (tools/parity.py) runs fresh Java and this checkout's game and compares them.
+To compare archived binaries: admit fresh Java with --reference-only --work-dir REF, then
+reuse exact REF bytes for each with --reference-dir REF --binary GAME --work-dir NEW_OUT.
 No output masks, ordering normalization or synthetic tag observer are applied.
 """
 import json
@@ -89,7 +90,6 @@ def main():
         sys.argv.append("--allow-gaps")
     folder = Path(sys.argv[sys.argv.index("--work-dir") + 1]).resolve()
     if reference is None:
-        assert "--reference-only" in sys.argv, "admit fresh Java, then reuse its frozen reference"
         runner.main()
     else:
         assert "--reference-only" not in sys.argv

tools/test_loot_mine_pot_components_parity.py

@@ -1,8 +1,9 @@
 #!/usr/bin/env python3
 """Actual loot-mine pot component boundary; raw snapshots and clocks retained.
 
-Admit fresh Java with --reference-only --work-dir REF; compare each archived
-normal Game against --reference-dir REF with a fresh --work-dir OUT.
+A plain run (tools/parity.py) runs fresh Java and this checkout's game and compares them.
+To compare archived binaries: admit fresh Java with --reference-only --work-dir REF, then
+compare each normal Game against --reference-dir REF with a fresh --work-dir OUT.
 """
 import json
 from pathlib import Path
@@ -92,7 +93,6 @@ def main():
         sys.argv.append("--allow-gaps")
     folder = Path(sys.argv[sys.argv.index("--work-dir") + 1]).resolve()
     if reference is None:
-        assert "--reference-only" in sys.argv, "admit Java before the native pair"
         runner.main()
     else:
         assert "--reference-only" not in sys.argv

tools/test_mob_discard_parity.py

@@ -3,6 +3,7 @@
 import argparse
 import hashlib
 import json
+import os
 from pathlib import Path
 import subprocess
 import zipfile
@@ -12,7 +13,7 @@ import lab
 def main():
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument('--game-dir', type=Path, default=lab.GAME)
-    parser.add_argument('--resources', type=Path, required=True)
+    parser.add_argument('--resources', type=Path, default=lab.RESOURCES)
     parser.add_argument('--java-home', type=Path)
     args = parser.parse_args()
     build = lab.LOCAL / 'rust-mob-discard-parity'