sccache 0.18.0 as RUSTC_WRAPPER with a shared eureka-sccache volume.
Idunn lib test build: 51 s cold, 29 s warm (83/83 hits). Slot wait, not
compilation, is the larger cost.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Idunn verification now runs cargo check --target x86_64-pc-windows-gnu
--bin idunn-host so a Windows-only compile break is caught on Yggdrasil.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Operator ruling 2026-09-22: better nothing than a harness that punishes
refactoring. Behavioural tests plus the ecosystem's mutation tools on a cut's
diff; Soul's hand mutants stay one-off probes. The stopgap image carries
cargo-mutants instead of pwsh and is tagged by its Dockerfile's hash.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
