c03db7938c
`xs.<method>` over a constrained pack projects a (zero-arg) protocol method across every element into a tuple: `xs.get` ≈ `(xs[0].get(), …, xs[N-1].get())`. lowerFieldAccess intercepts `xs.<m>` on a pack base (where <m> is a protocol method) and synthesizes/lowers `xs[i].<m>()` per element into a tuple_init. For a parameterised `Box(T)` the projected tuple is heterogeneous (each element returns its own T). examples/196-pack-value-projection.sx. Surfaced and fixed a pre-existing bug: inferExprType didn't handle tuple field access (`t.0` / `t.x`), so a mixed-size tuple like `(42, "hi")` inferred the string field as s64 — the wrong type then drove a bad `print` pack mangle and coerced the string to i64 (garbage). Added the tuple arm (numeric + named). Regression: a `(s64, string)` case in examples/190-tuple-values.sx.
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