v1.29.0 ✅

• IsFailed → IsFailure ⚠️ breaking rename — IsSuccess / IsFailure is the correct symmetric pair; find-and-replace across call sites
• Console samples — 3 new examples: 14_ValidationDSL, 15_OneOf5_OneOf6, 16_AsyncPatterns_Advanced (covers all v1.27–v1.28 features)
• FastMinimalAPI validation showcase — side-by-side /api/smart/validation (DSL vs DataAnnotations) and /api/smart/fluent-validation (bridge demo)
• FastMvcAPI parity — explicit .Validate() guard + CancellationToken in MVC controllers
• Feature Reference page — 109 features across 11 categories in docs
• 3,339 tests