🧹 Remove scratch test script accidentally committed 🧹

- .claude-test.sh: deleted — this was a throwaway local test harness
  used while verifying the entrypoint.sh/Dockerfile fixes, explicitly
  out of the AI.md runbook's scope, and was swept into the prior
  commit (d0b2477dad) by mistake.

.claude-test.sh

@@ -1,28 +0,0 @@
-#!/bin/sh
-set -x
-echo "== rustc =="; rustc --version
-echo "== cargo =="; cargo --version
-echo "== rustfmt =="; rustfmt --version
-echo "== clippy =="; cargo clippy --version
-echo "== just =="; just --version
-echo "== sccache =="; sccache --version
-echo "== cargo-nextest =="; cargo nextest --version
-echo "== cargo-audit =="; cargo audit --version
-echo "== cargo-binstall =="; cargo binstall --version
-echo "== targets installed =="; rustup target list --installed
-echo "== nightly + miri =="; rustup run nightly rustc --version; cargo +nightly miri --version
-echo "== cross compile aarch64-musl hello world =="
-mkdir -p /tmp/hello && cd /tmp/hello
-cat > Cargo.toml <<'EOF'
-[package]
-name = "hello"
-version = "0.1.0"
-edition = "2021"
-EOF
-mkdir -p src
-echo 'fn main() { println!("hello cross"); }' > src/main.rs
-cargo build --release --target aarch64-unknown-linux-musl
-file target/aarch64-unknown-linux-musl/release/hello
-echo "== rust-workflow help =="
-rust-workflow --help 2>&1 | head -20 || echo "rust-workflow not found or errored"
-echo "== ALL DONE =="