Extend defhandler with :path/:method/:csrf, migrate 12 ref endpoints to SX
defhandler now supports keyword options for public route registration:
(defhandler name :path "/..." :method :post :csrf false (&key) body)
Infrastructure: forms.sx parses options, HandlerDef stores path/method/csrf,
register_route_handlers() mounts path-based handlers as app routes.
New IO primitives (boundary.sx "Web interop" section): now, sleep,
request-form, request-json, request-header, request-content-type.
First migration: 12 reference API endpoints from Python f-string SX
to declarative .sx handlers in sx/sx/handlers/ref-api.sx.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
giles
fba84540e2