e631e799

By: Valentin Hirschi <valentin.hirschi@gmail.com>

let bracketed identity transport propose larger safe steps

Start optional Bracketed identity-coordinate trials at three quarters of the nearest-pole radius, retaining the existing backtracking and every numerical acceptance check. Halving and mapped-coordinate proposals keep their prior behavior.

Add a public polynomial-solution regression that verifies 10201 and fewer charts, and document the reproducible test command. Relevant existing tests and independently refined four-loop point checks passed.