chore(run-engine): gitignore benchmark output artifacts

Ignore the generated micro-benchmark output (bench-results/) and the
standalone e2e harness run artifacts (node_modules, e2e-results, manifests,
.env, lockfiles) so benchmark runs do not dirty the tree.

internal-packages/run-engine/.gitignore

@@ -0,0 +1,2 @@
+# Micro-benchmark output (generated by ckMicroBench.bench.test.ts)
+bench-results/

internal-packages/run-engine/design/benchmarks/e2e-tasks/.gitignore

@@ -0,0 +1,7 @@
+# Standalone deploy/run artifacts (this project is installed + run outside the monorepo)
+node_modules/
+.trigger/
+e2e-results/
+.env.bench
+pnpm-lock.yaml
+package-lock.json