stillwater-sc / universal / 27843770549

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Commit Message

feat(elreal): math facade -- functions + constants (#1079 Phase 4) (#1083)

Phase 4 of the elreal class facade (#1079): mathlib.hpp lifts the ZBCL-level
LFPERA math (math/*.hpp) to class elreal.

- unary (refine to operand precision()): sqrt exp log sin cos tan asin acos atan
  sinh cosh tanh -- each forwards to the same-named ZBCL overload via stream()
  and re-wraps; stays lazy.
- binary (deeper operand): pow, hypot.
- constants (FpType defaults to double): elreal_pi/e/ln2/ln10/log2_10/
  sqrt2/sqrt3/sqrt5/phi/euler_gamma.
- umbrella pulls the math suite in through mathlib.hpp.

Test elastic/elreal/api/math.cpp: constants vs reference, sqrt/exp-log/trig/
hyperbolic identities, pow(2,10)=1024, hypot(3,4)=5, precision threading.
gcc + clang + gcc Debug-with-assertions green; full CI (incl Codacy/ASan/UBSan/
Coverage) green. The fast test skips elreal_e()/elreal_euler_gamma() (still the
eager e_zbcl/euler_gamma_zbcl path, ~10-16 s each -- online conversion is #1061
Phase 3b); e is checked via exp(1).

Relates to #1079

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