`PW5102`

Retired: the compiler no longer prints it, and its number is never reused.

a shared materialization's cache key must separate the build that produced it. Retired 2026-08-06: the compatibility generation is now injected by the compiler for every materialized entry, so the key cannot omit it. If a generated storage key ever lacks its compatibility namespace that is an internal compiler invariant, not an error an application author can repair.