docs(phase29al): ssot skeleton/feature model; planfrag freeze tag

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Status: Active
Scope: JoinIR / PlanFrag “仕上げ”の設計SSOT仕様不変
Related:
- docs/development/current/main/design/coreplan-skeleton-feature-model.md
- docs/development/current/main/design/planfrag-ssot-registry.md
- docs/development/current/main/design/planfrag-freeze-taxonomy.md
- docs/development/current/main/design/joinir-plan-frag-ssot.md
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# Phase 29al: CorePlan composition hardening (docs-first)
Goal: “pattern が重なる/増殖する” を設計で根治し、JoinIR/PlanFrag を **美しく閉じる**ための SSOT を揃える。
## P0: Skeleton/Feature model SSOTdocs-only
- 指示書: `docs/development/current/main/phases/phase-29al/P0-SKELETON-FEATURE-SSOT-INSTRUCTIONS.md`
- ねらい: “骨格→特徴→合成” を SSOT として固定し、通らない/危険なパターンも Freeze taxonomy に落とす
- 成果: `docs/development/current/main/design/coreplan-skeleton-feature-model.md`
## Next (planned)
### P1: post-phijoin 入力の最終表現SSOT
- ねらい: join 値の “最終表現” と “局所 verify” の不変条件を SSOT 化するemit/merge の再解析禁止を強化)
### P2: effect classification SSOT
- ねらい: pure/control/rc/observability などの効果分類と、許される変形(最適化/RC挿入/DCEを法典化する