Restore sx_server.ml, add host-* stubs for boot-helpers.sx
The previous commit accidentally lost ~1100 lines from sx_server.ml
due to a git stash conflict resolution that silently deleted the
hash-index, manifest generation, and /sx/h/ route handler code.
Restored from 97818c6d. Only change: added host-* platform primitive
stubs (host-get, host-set!, host-call, etc.) needed because the
callable? fix in boot-helpers.sx now properly loads code paths that
reference these browser-only functions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in: