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feat(joinir): Phase 94 - P5b escape full E2E (derived ch + +1/+2)

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nyash-codex
2025-12-17 00:59:33 +09:00
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# Phase 94: P5b “完全E2E” のための `ch` 再代入対応
- 目的: `tools/selfhost/test_pattern5b_escape_minimal.hako` を JoinIR（Pattern2Break）で VM E2E PASS に固定する。
- 新箱: `BodyLocalDerivedEmitter`（`src/mir/join_ir/lowering/common/body_local_derived_emitter.rs`）で `ch` を Select ベースの derived 値として表現する。
- 契約: `escape_cond` は base 値で評価し、override は副作用なし・評価順を SSOT 化。`HAKO_JOINIR_STRICT=1` では未対応形を理由付き Fail-Fast。