Fix callable? type mismatch, restore 20 HS test regressions, add host-* server stubs
callable? in boot-helpers.sx checked for "native-fn" but type-of returns "function" for NativeFn — broke make-spread and all native fn dispatch in aser. Restore 20 behavioral tests replaced with NOT IMPLEMENTED stubs by the test regeneration commit. Add host-* platform primitive stubs to sx_server.ml so boot-helpers.sx loads without errors server-side. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in: