The heal decision is extracted into should_heal_self_marker_refusal()
so the contract is testable: heal ONLY on exit 2 + a marker naming this
process. Five tests pin it — self-owned heals, foreign owner (real live
sibling process) never heals, missing/garbage marker never heals,
non-exit-2 never heals, and the full acquire -> refuse -> drop-claim ->
retry-precondition lifecycle with a real UpdateMarkerGuard.
windows-rust-e2e.yml mirrors the wine2e pattern: fires only on
wine2e-rust/** pushes, runs the crate's cargo test --lib on
windows-latest (the shipping platform). The permanent Linux lane stays
authoritative for the unix-gated pipe-drain fixtures.
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