pub const MAX_WAKE_SOURCES: usize = 8; // 8usizeExpand description
phase-436 B2 — the other half of the seam, for the boards that now use it.
port_park above is what a port hands the executor to WAIT with;
these are what it hands the executor to be told WHEN. A board registering
a deadline source receives a WakeSourceId and reads it back out of
Executor::last_park(), so without this re-export it could match on
neither.
How many platform sources one executor can carry. A plain const, not a
sizing knob: the table is inline, so no allocator is required on the no_std
targets this seam mainly exists for.