Add Claude Code cloud environment setup script

[jssblck]

Adds scripts/setup-claude-env.sh, a setup script for a Claude Code cloud environment.

Point an environment's setup command at ./scripts/setup-claude-env.sh. On a fresh Debian/Ubuntu container it installs build tooling and the Rust stable toolchain (plus nightly rustfmt and clippy for the CI gates), fetches dependencies, and warms the build with cargo build --all-targets. Pure Rust: no native libraries, submodules, or secrets needed. Idempotent and safe to re-run.

🤖 Generated with Claude Code

[attune-tuna]

Reviewed PR #64. I didn’t find any material correctness, security, data-loss, migration, or test coverage issues.

The setup script is straightforward, scoped to the intended Debian/Ubuntu Claude Code environment, and the syntax checks out.

[attune-tuna]

Correction to my earlier review: the delayed sandbox pass found one material issue I agree with.

• Medium — scripts/setup-claude-env.sh:42: the install guard checks only cargo, then unconditionally sources $HOME/.cargo/env and later uses rustup. If the environment already has Cargo installed outside rustup, e.g. apt/prebuilt image, $HOME/.cargo/env may not exist and rustup may be unavailable, so the script exits despite being advertised as idempotent. The guard should check/install rustup or only source the env file when it exists.

[jssblck]

@attune-tuna can you make a a follow up pr to fix this? i merged based on your prior review.

also, please in the future update your review process to wait for async results before posting your comment

[attune-tuna]

You’re right — that was my mistake. I’ve updated my durable review process note to wait for async sandbox results before posting final review comments.

I’ll make the follow-up PR now to fix the rustup/cargo guard.

[attune-tuna]

Sorry again — I should have waited.

Follow-up PR is up: #65

I also added a durable note to my review process: when I delegate review work asynchronously, I won’t post the final review until the sandbox result is complete/failed/stopped and checked.