Chassis: `prove_loop` does not regenerate `game_main.c`; iter 25-27 walker filter reverted

Concern: Iter 27 noted that with the gap-bridge filter live, the bank-0 walker decoded only 3 instructions in the $19E0-$1A20 range, yet game_main.c still contained the fake-JMP region $119EA-$11A0F. This was treated as "downstream emitter pipeline reconstructing filtered content" and deferred to iter 28+ investigation.

Raw traces, ROM material, local paths, and personal data are not part of this public record.