Constant COMPATIBILITY_DATE 

pub const COMPATIBILITY_DATE: &str = "2026-07-01";

Compile-time pinned compatibility date. Cloudflare uses this to lock Workers runtime behaviour. When to bump it, and the gate a bump must pass, is the policy in design/bynk-release-discipline.md (“Part 3 — The Workers compatibility date”, #1677): reviewed at each release, and moved only after the workerd smokes pass on the new date.