Introduce [spa_e| ... ] for Expr and [spa| ... ] for Stmt, scoped to the
Spa namespace via a dedicated syntax category and macro_rules. This removes
the deeply nested .andThen / .basic (.assign ...) boilerplate when writing
programs; Main.lean's test programs are rewritten to use it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- 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>
