chore: update header comments in script files to indicate AI generation

.github/scripts/aggregate_benchmarks.py

@@ -1,4 +1,7 @@
-#!/usr/bin/env python3
+##########################
+### AI-generated file. ###
+##########################
+
 """Aggregate and merge benchmark JSON files.
 
 The workflow runs the same benchmark suite on multiple independent runners.

.github/scripts/compare_benchmarks.py

@@ -1,4 +1,7 @@
-#!/usr/bin/env python3
+##########################
+### AI-generated file. ###
+##########################
+
 """Compare benchmark JSON files and write a GitHub Actions summary.
 
 The script supports JSON emitted by hyperfine, JSON emitted by pytest-benchmark,

.github/scripts/run_benchmarks.sh

@@ -1,4 +1,9 @@
 #!/usr/bin/env bash
+
+##########################
+### AI-generated file. ###
+##########################
+
 set -euo pipefail
 
 mkdir -p benchmark-results

.github/scripts/run_with_bec_servers.py

@@ -1,4 +1,7 @@
-#!/usr/bin/env python3
+##########################
+### AI-generated file. ###
+##########################
+
 """Run a command with BEC e2e services available."""
 
 from __future__ import annotations