ci: gas budget regression gate

.github/workflows/gas.yml

@@ -0,0 +1,24 @@
+name: Gas Budget Regression Gate
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  gas-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Run Gas Regression Script
+        run: |
+          chmod +x scripts/gas-regression.sh
+          # Replace these with actual gas fetching commands in real usage
+          BASELINE_GAS=1000000
+          NEW_GAS=1040000
+          ./scripts/gas-regression.sh $BASELINE_GAS $NEW_GAS

scripts/gas-regression.sh

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+#!/bin/bash
+set -e
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 <baseline_gas> <new_gas>"
+    exit 1
+fi
+
+BASELINE=$1
+NEW=$2
+
+echo "Comparing baseline gas ($BASELINE) with new gas ($NEW)..."
+
+awk -v base="$BASELINE" -v new="$NEW" 'BEGIN {
+    if (base == 0) {
+        print "Baseline gas is 0. Cannot compute regression."
+        exit 1
+    }
+    diff = new - base
+    pct = (diff / base) * 100
+    printf "Gas change: %.2f%%\n", pct
+    if (pct > 5.0) {
+        print "Error: Gas regression exceeds 5% CPU/instruction budget!"
+        exit 1
+    }
+    print "Gas budget check passed."
+    exit 0
+}'