Constant STRATEGY_ALL_AT_ONCE 

pub const STRATEGY_ALL_AT_ONCE: &str = "all-at-once";

Canonical strategy string for the all-at-once rollout shape.

Operators declare it terse: rolloutPolicies.all-at-once.strategy = "all-at-once"; — typically with no explicit waves because the strategy’s semantic name is “ship everywhere, no staging.” Without post-deserialization normalization the applier’s per-wave soak lookup falls through to DEFAULT_SOAK_MINUTES = 60, contradicting the strategy.