stillwater-sc / universal / 26848207996

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feat(elreal): sinh / cosh / tanh (Phase 7.4, #931) (#1042)

Direct identities on the Phase 7.3 exp():
  sinh(x) = (e^x - e^-x)/2,  cosh(x) = (e^x + e^-x)/2,
  tanh(x) = (e^2x - 1)/(e^2x + 1)
in math/hyperbolic.hpp. Same modest default depth (4) and time/precision
characteristics as exp/log (see #1040).

Tests (elastic/elreal/math/hyperbolic.cpp) on {double, float} (exp-based series,
same host scope as 7.3): value vs std::<fn>, cosh^2 - sinh^2 == 1,
tanh == sinh/cosh, parity sinh(-x)==-sinh(x) / cosh(-x)==cosh(x); 0-overlap on
every result.

All 30 elreal tests pass on gcc and clang (Release) and with assertions on
(~0.4s); RISC-V cross-compiles clean; ASCII clean.

Relates to #931 (sub-phase 7.4).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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