The implicit address-of that gives `*T` params reference semantics only fired for plain identifiers (`mut(v)`). For a field-access / index / deref lvalue (`make_move(self.board, m)`, `mut(w.s)`), the branch was skipped: the arg was loaded into a temporary and the callee mutated a throwaway copy — silent data loss, with the type check satisfied through the temp so no diagnostic fired. Now compound lvalues auto-ref too: take the real lvalue address via `lowerExprAsPtr`, normalizing the "place" ref to `*T` exactly as `@field_access` does. Mutations through the pointer are now visible to the caller, matching the identifier case. Regression: examples/255-autoref-compound-lvalue.sx.
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