mes: 94.81% -> 94.89%

[SirEnkido]

What changed

CMes::addString (src/mes.cpp):

• scoped #pragma opt_lifetimes off around the function (off/reset paired, house-accepted pattern)
• the next message byte is read via a direct unsigned char pointer dereference instead of the single-use ReadMesChar inline helper — this drops a return-temp mr the target does not have
• follow-up commit removes the now-unused ReadMesChar helper (no other call sites; score unchanged)

Evidence

• main/mes fuzzy (report.json): 94.8078% → 94.8926%
• All three intermediate scores in the commit messages were independently reproduced by rebuilding each revision
• build/GCCP01/ok passes

Notes for review

• If the original source used ReadMesChar elsewhere in future matches, it can be trivially re-added; today it has no other call sites.
• Per WORK_SPLIT.md guidance, the scoped pragma should be retested for removal after future structural changes to this function.

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