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Author SHA1 Message Date
Maximus Gorog
5454c02328 Fix explosion.rs over-approximation: use cospan rewrite data for correct covering relations 
- Replace all-to-all sub-poset connection with rewrite-based correspondence
- Add compute_subpoint_correspondence() using cone structure for 3 cases:
  identity (1-to-1), contraction (many-to-one), insertion (index shift)
- Add compute_height_maps() for singular and regular height tracking
- Covering relations reduced from 114 to 35 for half_braid (69% reduction)
- Surface 3 (r0,s0,r0): 9 spurious successors → 3 correct successors
- 175 tests passing, 0 failures
- Regenerated fixtures/half_braid_geometry.json with corrected boundaries

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-04-08 00:54:18 -06:00
Maximus Gorog
cd4b951f78 Scaffold zigzag-engine library 
Initial structure implementing the zigzag construction for associative
n-categories (LICS 2022 paper). Includes:

- monotone.rs: MonotoneMap with Wraith's R equivalence (complete)
- zigzag.rs: Zigzag<T>, ZigzagMap<S> with composition
- diagram.rs: Diagram, DiagramN, Cospan, Rewrite, Cone types
- signature.rs: Generator, Signature (complete)
- degeneracy.rs: Degeneracy detection stubs
- normalise.rs: Construction 17 algorithm structure
- typecheck.rs: Type checking against signatures
- explosion.rs: k-points and Poset for layout
- layout.rs: SpringConstraint API surface

All 33 unit tests pass.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-04-07 02:42:06 -06:00