Verner 7 Integrator (#1)

Co-authored-by: Connor Johnstone <connor.johnstone@arcfield.com>
Reviewed-on: #1

roadmap/README.md

@@ -34,11 +34,13 @@ Each feature below links to a detailed implementation plan in the `features/` di
   - **Dependencies**: None
   - **Effort**: Small
 
-- [ ] **[Vern7 (Verner 7th order)](features/02-vern7-method.md)**
+- [x] **[Vern7 (Verner 7th order)](features/02-vern7-method.md)** ✅ COMPLETED
   - 7th order explicit RK method for high-accuracy non-stiff problems
-  - Efficient for tight tolerances
+  - Efficient for tight tolerances (2.7-8.8x faster than DP5 at 1e-10)
+  - Full 7th order dense output with lazy computation
   - **Dependencies**: None
   - **Effort**: Medium
+  - **Status**: All success criteria met, comprehensive benchmarks completed
 
 - [ ] **[Rosenbrock23](features/03-rosenbrock23.md)**
   - L-stable 2nd/3rd order Rosenbrock-W method
@@ -327,13 +329,14 @@ Each algorithm implementation should include:
 ## Progress Tracking
 
 Total Features: 38
-- Tier 1: 8 features (1/8 complete) ✅
+- Tier 1: 8 features (2/8 complete) ✅
 - Tier 2: 12 features (0/12 complete)
 - Tier 3: 18 features (0/18 complete)
 
-**Overall Progress: 2.6% (1/38 features complete)**
+**Overall Progress: 5.3% (2/38 features complete)**
 
 ### Completed Features
-1. ✅ BS3 (Bogacki-Shampine 3/2) - Tier 1
+1. ✅ BS3 (Bogacki-Shampine 3/2) - Tier 1 (2025-10-23)
+2. ✅ Vern7 (Verner 7th order) - Tier 1 (2025-10-24)
 
-Last updated: 2025-10-23
+Last updated: 2025-10-24