Constant REASON_DEGRADED_RENDEZVOUS_TIMEOUT 

pub const REASON_DEGRADED_RENDEZVOUS_TIMEOUT: &str = "vCPU rendezvous timed out before parked acknowledgement";

Reason string written into DegradedFailureDumpReport::reason when the freeze coordinator’s vCPU rendezvous timed out before every parked acknowledgement arrived. Wire-format-stable: matches the operator-grep contract used by every other REASON_* constant in this module. The dynamic detail appended at emit time (<timeout_ms> / <parked> / <expected>) lets an operator see which vCPUs stalled without a separate field.