chore: import upstream snapshot with attribution

scripts/agent_trace.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+prompt=${1:-"Use the bash tool to run 'pwd', then use the ls tool to list the current directory, then respond with DONE."}
+provider=${JCODE_PROVIDER:-auto}
+cargo_exec="$repo_root/scripts/cargo_exec.sh"
+
+if [[ ! -x "$repo_root/target/release/jcode" ]]; then
+  (cd "$repo_root" && "$cargo_exec" build --release)
+fi
+
+workdir=$(mktemp -d)
+trap 'rm -rf "$workdir"' EXIT
+
+JCODE_HOME="$workdir" PATH="$repo_root/target/release:$PATH" \
+  jcode run --no-update --trace --provider "$provider" "$prompt"