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Decision
Amend ADR-057 with #5292 D1: one keyless, sealed-message scheduler per host and VM-scoped key holders. Record why a single-tenant key-holding daemon widens the compromise radius, the existing HVF/libkrun supervisor candidates and Firecracker's lack of a separate supervisor, and the limits of this boundary (scheduler metadata, per-VM key-holder compromise, trusted host). This is an architecture decision, not a shipped guarantee.
Validation
git diff --check,xtask check-adr-coverage,xtask check-witness-citations(327 citations) andxtask check-claim-catalog(21 claims, 176 witnesses) passed on this branch. No runtime or hardware witness for this docs-only change.Refs #5292 and #5510; no auto-close because implementation remains open.