Serialize cost toolchain executable fixture checks

Author: a19q3

scripts/cellscript_gate.sh

@@ -641,7 +641,8 @@ run_dev_gate() {
 prepare_cost_evidence() {
     printf '{"status":"not-generated","reason":"cost corpus has not completed"}\n' >"$CELLSCRIPT_COST_CORPUS_REPORT"
     printf '{"status":"not-generated","reason":"multi-Script corpus has not completed"}\n' >"$CELLSCRIPT_MULTI_SCRIPT_COST_REPORT"
-    run cargo test --locked -p cellscript --test cost_toolchain
+    # Keep temporary executable fixtures and process-launch checks serialized.
+    run cargo test --locked -p cellscript --test cost_toolchain -- --test-threads=1
 }
 
 check_cost_evidence() {

tests/fixtures/business_corpus.json

@@ -1010,7 +1010,7 @@
       ]
     }
   ],
-  "inventory_sha256": "0x6f59d2ab6660050170652c0a4e3fe99af27d0b93fdec9965bfc3a23fe485ad5a",
+  "inventory_sha256": "0xf5ec5f49baf03fcc6bf4c2f2e5dd38da015b78fb9d90a3712c14e744305b9648",
   "release_requirements": {
     "backend": "passed",
     "ci": "passed",