Take upload stamps before protection, initialize cached checks from those
stamps, and wait out pages another thread is unprotecting before retrying.
Publish page generations before advancing the clock again in both the fault
handler and batched host pre-write path. A shared stamp_page helper closes
the remaining batched publication race in the original PR.
Add deterministic publication regressions for both paths and document the
mechanism and the limits of the game-level evidence. The regressions fail
on main, and the batched case also fails with the original PR applied.
Validation: full graphics suite, Wonder Mac host build, all 133 iOS source
compile checks, and documentation tests pass. No fresh gameplay or iPhone
runtime validation.
Co-authored-by: Aleksandr Svidchenkov <a.svidchenkov@gmail.com>
