v1.19.4

What changed

• feat(thread-gate): let the client fall back to stateless when a turn is routed off-thread
• Revert "fix(routing): keep server-side-thread and oversized requests off providers"
• fix(routing): keep server-side-thread and oversized requests off providers
• fix(rc-gate): the sleep detector was inert — use the kernel's wake clock
• fix(rc-gate): stop paging on system sleep — a suspend is not an event-loop stall

Full changelog: v1.19.3...v1.19.4