ringmenu: drop 76 invented extern fp consts for literals (96.454% -> 96.461%)

[SirEnkido]

What changed

src/ringmenu.cpp, two commits:

• Replaced 76 invented extern const float/double kRingMenu* named constants with plain inline literals, so MWCC folds them into the anonymous .sdata2 pool and the code fp-relocs align byte-identically with the target (satisfies the AGENTS.md rule against extern-as-crutch and biases toward original source)
• Wrote drawCommand's scale as 0.8 - 0.25*fabs(angle) so the pooled doubles emit in the target's order

Evidence

• main/ringmenu fuzzy (report.json): 96.454% → 96.461%
• DOL verified byte-identical (build/GCCP01/ok passes); only src/ringmenu.cpp touched
• Independently audited: 0 externs remain, all 15 /* --INFO-- */ headers preserved, no offset tricks or fake symbols

Notes for review

• Small headline gain, but the substantive win is removing 76 fabricated extern constants in favor of real literals — the file now reads much closer to plausible original source.
• The remaining gap in onDraw/onCalc/drawGBA/drawCommand/GetDispCounter was each traced to documented register-allocation / scheduling / anonymous-pool walls and left unhacked. Details in the commit messages.
• drawCommand's scale literal is written as the exact (double)0.8f value for byte-identical pool matching — intentional, flagged for transparency.

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