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Lean migration: Phase 7 (Sign + Constant analyses, executable)

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- Spa.Showable: port of Showable.agda (quoted strings, map format) for
  output parity
- Spa.Analysis.Utils: eval_combine₂
- Spa.Lattice.AboveBelow.le_cases: order of the flat lattice by cases
- Spa.Analysis.Sign / Spa.Analysis.Constant: the four monotonicity
  POSTULATES from the Agda files are now proved theorems (via le_cases);
  interpretations, evaluator validity, analyze_correct per analysis
- Main + lake exe spa: runs both analyses on the Agda test program;
  constant analysis folds unknown=0, sign analysis gives unknown=⊤

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Danila Fedorin
2026-06-09 20:52:08 -07:00
parent 739fbb503c
commit a82d54666a
9 changed files with 854 additions and 1 deletions
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LEAN_MIGRATION.md
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@@ -80,4 +80,4 @@ validate phase by phase.
- [x] Phase 4
- [x] Phase 5
- [x] Phase 6
- [ ] Phase 7
- [x] Phase 7