- types.Type: add dedicated `unresolved` variant (mirrors ir.TypeId.unresolved)
with eql/displayName arms; bridgeType maps it to TypeId.unresolved.
- sema.inferExprType + signature/field resolution: every Type.fromTypeExpr /
fromName / symbol lookup miss and call/field/index fallthrough now yields
Type.unresolved instead of a fabricated s(64). A variadic `..xs: []T` slice
element is taken from T, not a guessed "s32". Genuine literal defaults
(int=>s64, float=>f32, .len=>s64) kept.
- Builder.getRefType: an unlocatable ref (no active function / out-of-range)
returns .unresolved, not .s64 -- this is the accurate type source the pack
mono / binop / null-cmp fixes rely on, so it must not fabricate.
236 examples + unit tests (incl sema) green.
