chore: expand Codex environment setup

Author: tzanko-matev

.agents/codex-setup

@@ -1,7 +1,15 @@
 #!/usr/bin/env bash
+set -euo pipefail
+
+# Install the tooling required to build and test the CodeTracer project.
+# The list of packages is derived from `Justfile` and `flake.nix`.
 
 AGENTS_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
-cd $AGENTS_DIR
+cd "$AGENTS_DIR"
 
 apt-get update
-apt-get install -y --no-install-recommends just
+DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    python3 python3-pip python3-venv python3-dev \
+    cargo rustc just pkg-config capnproto
+
+pip3 install --no-cache-dir --break-system-packages maturin uv

.agents/tasks/2025/08/15-1323-initial-test-suite

@@ -0,0 +1,2 @@
+--- FOLLOW UP TASK ---
+Create a script which will be used in future to set-up the Codex environment for development and testing of this project. Base this on what you see in Justfile and flake.nix. Note that not all packages described in flake.nix will be needed in the Codex environment, but we do care about building the project and running the tests.

.gitignore

@@ -3,4 +3,5 @@
 .aider*
 .venv/
 **/target/
-build
+build
+*~