Constant MAX_LOG_BYTES 

const MAX_LOG_BYTES: u64 = _; // 52_428_800u64

Rotation cap for agentmux-launcher.log (SPEC_WIN10_PAGEFILE_OOM_CRASH_ 2026_06_29 P1). This file mirrors the srv subprocess’s entire stderr stream verbatim, forever, with no rotation of its own — left unbounded it grew to 406 MB across 69 days on a real machine, directly tightening the page-file ceiling the pagefile-OOM spec is about. 50 MB per file × 3 rotated files + the live file ≈ 200 MB worst case, versus unbounded.