d7ecf02d7a
A pack spread in call-arg position now expands to N positional args: `add2(..xs.get)` ≈ `add2(xs[0].get(), xs[1].get())` — the canonical's `mapper(..sources.value)` shape. The call-arg loop detects a spread whose operand is a pack (`..xs`) or a pack projection (`..xs.method`) and splices the per-element Refs in; a runtime-slice spread (`..arr`) is still left to the slice-variadic path. Factored the per-element synthesis out of lowerPackValueProjection into `lowerPackElems` (used by both projection-to-tuple and spread-to-args), plus a `packSpreadRefs` helper. examples/197-pack-spread-call.sx (2- and 3-arg, mixed element types).
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