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proof+design: verified counterexample + four-layer preservation redesign - #153

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proof/l1-region-threading-design

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proof+design: verified counterexample + four-layer preservation redesign#153
hyperpolymath wants to merge 19 commits into
mainfrom
proof/l1-region-threading-design

Commits on May 26, 2026
- proof+design: verified counterexample to preservation + four-layer redesign
  
  hyperpolymath
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  claude
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  06e344f
- proof(L1): typing judgment with R-threading + counterexample regression Qed (#155)
  
  hyperpolymath
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  claude
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  1e9d40f
- proof(L1): Semantics_L1.v skeleton — preservation_l1 theorem stated (#157)
  
  hyperpolymath
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  claude
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  1e45e3f
- proof(L1.A): value_R_G_preserving_l1 Qed (#158)
  
  hyperpolymath
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  c6b1cda
- proof(L1.B): region_shrink_preserves_typing_l1 Qed via _gen helper (#159)
  
  hyperpolymath
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  9b9f3fe
- proof(L1.C): subst_preserves_typing_l1 Qed (with strengthened statement) (#160)
  
  hyperpolymath
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  65d665e
- proof(L1.D): preservation_l1 body — 29/33 cases closed, 4 admits surface R-weakening gap (#161)
  
  hyperpolymath
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  d0c5117
Commits on May 27, 2026