Add support for docker compose (build, up, exec, ps, restart)

Problem

rtk discover flagged docker-compose as my single largest unhandled command surface — across 30 days I had:

• docker compose ... — 724 invocations
• docker-compose build — 222
• docker-compose up — 194
• docker-compose exec — 185
• docker-compose ps — 101

Total: ~1,426 invocations not benefiting from RTK. docker exec is already handled (rtk docker), but the compose family isn't.

Proposal

A rtk compose <subcommand> (or auto-detection of docker compose ... / docker-compose ...) that compresses the same way rtk docker does:

• build — collapse layer-cached steps, surface only actual build steps + warnings/errors
• up / up -d — drop ASCII spinners and "Container ... Started" noise; one line per service
• ps — same compact table style as rtk docker ps
• exec — passthrough (no compression needed, but routes through hook)
• restart — ok <service> style, like rtk git push

Why it matters

For projects on docker-compose, every up/build/ps cycle dumps hundreds of tokens of progress UI into Claude's context. Estimated savings on my usage alone: ~80% on build/up output.