rexcode/ir: add Type_Kind.BOOL + array <id> length; SPIR-V bool/array round-trip

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Extend the shared type model so SPIR-V's OpTypeBool and OpTypeArray (whose length
is a constant <id>, not a literal) lower cleanly:
  - ir.Type_Kind gains BOOL (a distinct boolean; LLVM i1 will use it too).
  - ir.Type gains len_ref: Id -- an ARRAY length carried as a constant <id>
    (alongside the existing literal count for dialects with literal lengths).
  - type_bool / type_array constructors.

SPIR-V codec: OpTypeBool <-> Type{.BOOL}; OpTypeArray <-> Type{.ARRAY, elem,
len_ref}. Test bool_and_array round-trips byte-exact -> 6 passed.

NOTE: a spec-valid module orders an array's length constant before the array
type; the codec round-trips the shape byte-exact regardless, but emitting the
types/constants section in dependency order is a follow-up.

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