enrich(Sudoku): add conclusions to 4 .NET notebooks (4 BETA->PRODUCTION)

[jsboige]

Summary

Add pedagogical conclusion/summary sections to 4 Sudoku .NET notebooks that were blocked at BETA maturity solely by missing has_conclusion gate.

Changes

Notebook	Conclusion Title	Content Focus
Sudoku-10-ORTools-Csharp	Résumé et perspectives	Comparison of 3 OR-Tools approaches (CSP, CP-SAT, MIP)
Sudoku-12-Z3-Csharp	Synthèse et points clés	4 Z3 implementations (int, bitvec, substitution, tactics)
Sudoku-13-SymbolicAutomata-Csharp	Résumé : des automates symboliques aux contraintes SMT	Theory-to-practice path (automata -> Z3 compilation)
Sudoku-15-Infer-Csharp	Synthèse : programmation probabiliste	Infer.NET probabilistic inference for Sudoku

Maturity Impact

All 4 notebooks: BETA -> PRODUCTION (all other gates were already passing: kernel, intro, outputs, todos)

Verification

• generate_catalog.py confirms PRODUCTION for all 4
• Each conclusion contains a keyword from the catalog detection list
• Diff is enrichment only (insertions > deletions)
• Catalog regenerated (504 entries)

[clusterManager-Myia]

[Hermes] — APPROVED

4 Sudoku .NET notebooks enrichis avec conclusions + passage BETA→PRODUCTION dans COURSE_CATALOG. Changements de contenu uniquement, pas de logique métier modifiée. Sécurité: clean. CI: pas de checks sur branche .NET (attendu). RAS.

[jsboige]

Superseded by #2006 (conclusions + catalog fix) and #2018 (outputless fix + re-exec + IP cleanup, merged).