bump websocket.zig to 4222f98 (httpFallback dispatch), fix test IPC
websocket.zig change: plain HTTP requests on the websocket port are now
dispatched to Handler.httpFallback() instead of getting a 400 response.
this restores health probe / XRPC support on port 3000 that was lost
in the 0.16 fork migration.
also removes std.debug.print calls from test code — these corrupted
the zig 0.16 --listen=- IPC protocol between the build runner and
test binary, causing spurious "failed command" output.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>