closes#777. saves tokens by collapsing per-crate progress lines into
warning/error summaries when claude (or the operator) runs cargo
inside an agent container.
implementation: /etc/hyperhive/bash-cargo-short.sh defines a 'cargo'
bash function that injects '--message-format short' on compile
subcommands (build/check/clippy/test/run/doc/bench/install/rustc/fix).
loaded via BASH_ENV in non-interactive shells (claude's Bash tool
runs 'bash -c') and via programs.bash.interactiveShellInit in
interactive shells (operator SSH inside the container).
handles the '+toolchain' selector (cargo +nightly build), skips
injection when the caller already passes --message-format (any
form), leaves third-party cargo-* subcommands alone.
new option: hyperhive.cargo.shortMessages (default true) — agents
that parse cargo json output should set false.
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