fix: sched round-robin, cap slot OOB panic, clippy, make ci

- RunList -> intrusive FIFO, no starvation, no silent drop
- cap table sized to CapSlot range (kani caught OOB panic)
- snake food color test uses const
- kani cfg lint, RUST_MIN_STACK for big kernel struct in tests

crates/types/src/macros.rs

@@ -25,7 +25,7 @@ macro_rules! bounded {
             pub const MAX: $inner = $max;
 
             pub fn new(value: $inner) -> Option<Self> {
-                if value >= Self::MIN && value <= Self::MAX {
+                if (Self::MIN..=Self::MAX).contains(&value) {
                     Some(Self(value))
                 } else {
                     None