gate: assert ARM64 gate binary identity (mirror x86_64 BINARY_MATCH)

SonicField · SonicField · commit 0a5f096d6f8e · 2026-04-21T17:48:31.000-07:00
Symmetric defense to e808676 — guards against any future ARM64 build-pipeline refactor (e.g., switching to cp-and-cache for build speed) silently regressing the binary-identity property. Today the ARM64 chain (cmake clean → fetch → checkout → build → test in same repo) inherently couples binary identity to checked-out commit, so the check is belt-and-suspenders. Per theologian 2026-04-22 00:47:10Z: the defense-in-depth value is in preventing future regression of the safety property, not in catching today's bugs. After build_phoenix.sh + chmod +x python: - capture sys.version of the freshly-built binary - grep for $ARM64_COMMIT (the just-checked-out short hash) - exit 99 if absent, with explicit ARM64_BINARY_MISMATCH message Existing 'ARM64_REMOTE_FAIL' cascade catches the non-zero exit and fails the gate. Transcript carries verbatim ARM64_BINARY_MATCH or ARM64_BINARY_MISMATCH for gatekeeper item python#11 verification.
diff --git a/scripts/gate_phoenix.sh b/scripts/gate_phoenix.sh
@@ -534,6 +534,15 @@ if [ "$ARM64" -eq 1 ]; then
         scripts/build_phoenix.sh 2>&1 | tail -5;
         echo BUILD_ARM64=\$?;
         chmod +x python;
+        ARM64_BINARY_LONG_VERSION=\$(./python -c 'import sys; print(sys.version)' 2>&1);
+        echo ARM64_BINARY_LONG_VERSION=\$ARM64_BINARY_LONG_VERSION;
+        if echo \"\$ARM64_BINARY_LONG_VERSION\" | grep -q \"\$ARM64_COMMIT\"; then
+            echo \"ARM64_BINARY_MATCH: ./python reports \$ARM64_COMMIT ✓\";
+        else
+            echo \"ARM64_BINARY_MISMATCH: ./python does not contain \$ARM64_COMMIT\";
+            echo \"GATE FAIL — ARM64 gate binary identity does not match HEAD\";
+            exit 99;
+        fi;
         JIT_ENABLE=1 ./python -m test test_phoenix_jit_arithmetic test_phoenix_jit_autocompile test_phoenix_jit_comparisons test_phoenix_jit_containers test_phoenix_jit_controlflow test_phoenix_jit_coverage test_phoenix_jit_functions test_phoenix_jit_generators test_phoenix_jit_loadattr_golden test_phoenix_float test_phoenix_hir_type test_phoenix_benchmark_correctness test_phoenix_deferred_compile test_phoenix_profiling_hooks test_phoenix_usetype_float 2>&1 | tail -10;
         echo ARM64_EXIT=\$?;
         echo STASH_POP_BEGIN;
