Checkpoint of the editor branch so work isn't carried loose across a branch
switch. Builds.
- maj0sted turnout geometry moved into the domain: domain::lay_turnout lays the
diverging path (pre-blade lead, blade at beta, arc of alfa-beta, frog rail) and
solve_junction is a thin adapter onto it.
- the maj0sted web/ tree renamed to editor/ (namespace and paths) - there is no
WASM here, it's plain native C++ the editor calls.
- click places the switch at its start (początek rozjazdu); the branch's leaving
straight is locked tangent to the frog; switches can be slid along the through
track and flipped L/P.
- Polish turnout templates carry catalogue length (Id-1-consistent lengths), plus
blade-angle and pre-blade fields (left 0 until the catalogue figures are in).
- TURNOUT_SPEC.md: the Bezier-based runtime/model contract.
- also folds in other pending branch changes (scenery, tests) to leave a clean tree.
