agra 9b50aacbe4 refactor(ir): converge structural type-shape resolution onto resolveCompound (A2.3b) ...

Codex corrective step before the A2 merge gate: A2.3 left type_bridge with a
parallel structural type-resolution algorithm and an inline tuple-literal-spread
shape in lower.zig with a `.void` fallback.

Finding 1 — single owner for structural shapes:
- TypeResolver.resolveCompound is now the sole structural type-shape
  constructor. Namespaced on `table` (so the stateless type_bridge can call it)
  and extended to own function types, plain `Closure(P...) -> R`, and plain
  positional/named tuples (it already owned *T/[*]T/[]T/?T/[N]T). It returns
  null only for the pack-shaped forms that need caller state (`Closure(..p)`,
  spread tuples); OOM yields `.unresolved`.
- type_bridge: deleted its 8 independent structural resolvers
  (resolveArray/Slice/Pointer/ManyPointer/Optional/Function/Closure/TupleType).
  resolveAstType delegates those node kinds to resolveCompound via a binding-free
  StatelessInner adapter. The only residual stateless shape code is two tiny
  fallbacks for the pack-shaped forms resolveCompound defers
  (resolveClosurePackShape — used by Into(Block) at registration time —
  and resolveTupleSpreadShape) plus resolveParameterizedType (kept:
  generic-instantiation convergence is A4.1 per PLAN-ARCH).
- lower.zig: stateful resolveTypeWithBindings uses resolveCompound; the
  `.function_type_expr` switch arm is gone. PackResolver.resolveFunctionTypeWithBindings
  deleted (subsumed). Plain closures/tuples now resolve via resolveCompound in
  both paths; only pack closures / spread tuples reach PackResolver.

Finding 2 — no `.void` failure fallback in lower.zig pack handling:
- the inline tuple_literal-with-spread type assembly moved into
  PackResolver.resolveTupleLiteralType (returns ?TypeId; OOM `catch return .void`
  became `catch return .unresolved`).

Alias result preserved: TypeTable.aliases stays gone; no table.aliases reads;
ProgramIndex.type_alias_map threaded explicitly.

type_resolver.test.zig: resolveCompound test rewritten (namespaced + new
function/closure/tuple/pack-shape arms, arena-backed). Gate green: zig build,
zig build test, run_examples 350/0.

2026-06-02 15:20:31 +03:00

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