On the S2.1a owning traversal, populate the last three ResolvedProgram side
tables, closing planspec S2.1's full-population acceptance (all ten domains):
- foreign_class_refs: a bare reference whose collected author is a
foreign_class_decl is routed here (its own domain) instead of the bare
type/value/callable table.
- struct_const_refs: a Type.CONST field access whose base resolves to a
struct author carrying that const member (mirrors lowering's struct_const_map).
- ufcs_refs: a ufcs_alias decl (alias -> target author) plus its UFCS-rewrite
call sites (alias(args), incl. pipe-desugared), via a global traversal-ordered
alias map mirroring lowering's flat ufcs_alias_map.
Still PARALLEL / UNCONSUMED / RAW: lowering reads the OLD selectors, no consumer
cut over, ResolvedRef stays raw. Byte-identical vs baseline (540 examples).
Population proof extended: a new resolver.test fixture exercises all ten domains
at once and asserts each side table non-empty + node-keyed for the three new ones.
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