[lgmp] core: add fixed-slot SPSC streams

Advance LGMP to the new separately versioned stream transport. This
provides fixed-slot, epoch-bound SPSC lanes without changing the
existing broadcast queue ABI.

Use reliable draining for clipboard and input payloads, and retain
transport-neutral notification hooks for a later doorbell backend.
This commit is contained in:
Geoffrey McRae
2026-08-15 13:44:31 +10:00
parent c861246d62
commit ca5593b139