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- RoutingDecision の missing_caps を Vec<CapabilityTag> に変更（型安全化） - error_tags は to_tag() メソッドで自動生成 - 全 callsite を enum variant に修正 - capability_tags モジュール（文字列定数群）を完全削除 - 全テスト PASS（型安全性向上を確認） - フォーマット適用
MIR Builder — Calls SSOT
Scope
- This directory is the single source of truth for call shaping in the builder.
- Responsibilities: target resolution, extern mapping, method lookup, flags/effects, MIR emission.
Out of scope
- Runtime dispatch details (VM/LLVM) and legacy by-name resolution. The VM keeps a legacy resolver only behind a dev flag for bring-up.
Contract
- Builder must populate
MirInstruction::Callwith a concreteCalleewhenever possible. - Arity and canonical names are normalized here so runtimes can be simple routers.
Phase-3 alignment
- VM call resolver is treated as legacy-only. Default runtime disables by-name fallback.
- Extern interface normalization aligns with
handlers/calls/externs.rs(runtime SSOT for extern dispatch).