fix: gate runner delegates to script/test instead of hardcoding cargo clippy

The acceptance gate was hardcoded to run cargo clippy, which fails on
non-Rust projects (Go, Node, etc.). Now the gate only runs script/test
which is project-specific. Clippy is added to storkit's own script/test
so Rust linting is preserved for this project.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

script/test

@@ -4,6 +4,9 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
 
+echo "=== Running cargo clippy ==="
+cargo clippy --manifest-path "$PROJECT_ROOT/Cargo.toml" --all-targets --all-features
+
 echo "=== Running Rust tests ==="
 cargo test --manifest-path "$PROJECT_ROOT/Cargo.toml"