Summary

• Teach rewrite to peel process-wrapper prefixes (timeout, time, nice, nohup, stdbuf) and rewrite the inner supported command.
• Preserve wrapper options, env prefixes, and compound command segments while leaving incomplete wrappers passthrough.
• Add regression coverage for wrapped cargo/git commands, timeout options, env composition, and missing inner commands.

Fixes #2375

Verification

• cargo +1.93.0 test process_wrapper -- --nocapture
• cargo +1.93.0 test prefix -- --nocapture
• cargo +1.93.0 fmt --all -- --check
• cargo +1.93.0 clippy --all-targets
• cargo +1.93.0 test --all -- --skip small_grep_not_worse_than_plain
• git diff --check
• cargo +1.93.0 run --quiet -- rewrite "timeout 300 cargo test" -> prints timeout 300 rtk cargo test and exits 3 per Ask verdict protocol