Light optimisation (deps at 2), line tables only, no LTO, debug assertions off (truck's debug-only checks reject valid geometry, the only reason tests used --release). Cold full `cargo xtask ci`: 14 min with all 647 tests passing; the oracle, step-corpus and app builds stay on --release. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT