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sx/examples
agra 19bc644b11 lang 2.4: enforce interface-only access on pack elements
A protocol-constrained pack element exposes only the constraint protocol's
interface (the locked decision): `xs[i].<member>` is rejected unless `<member>`
is one of the protocol's methods. `xs[i].v` (a concrete field of IntCell, not
declared on Box) now errors, like a constrained generic — even though the
substituted element is concretely an IntCell.

monomorphizePackFn records the pack param's constraint protocol in a new
`pack_constraint` map (pack-name → protocol); lowerFieldAccess checks it on an
`xs[i]` (index_expr) base BEFORE substitution erases the "constrained to P"
context. Protocol method calls (`xs[i].get()`) pass — the name is in the
protocol. Regression: examples/195-pack-interface-only.sx.
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