CI's `cargo fmt --all -- --check` has failed on every run because the
repo had no rustfmt config and was never formatted. Use the same settings
as EffectCraft/FilmCraft (max_width 160, use_small_heuristics Max), which
also keeps the churn small. Formatting only; no code changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
crates/automation/src/rpc.rs: a headless session behind the control
protocol's envelope (engine.execute, doc.*, session.list, batch), on
stdio or loopback TCP. MCP gains command_batch (headless and bridge).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>