Added the ability to select a method at runtime if so desired

roadmap/README.md

@@ -68,12 +68,14 @@ Each feature below links to a detailed implementation plan in the `features/` di
   - **Effort**: Small
   - **Status**: All four integrators implement `Tolerances`; no call site changed
 
-- [ ] **[Runtime Integrator Selection](features/41-runtime-integrator-selection.md)**
+- [x] **[Runtime Integrator Selection](features/41-runtime-integrator-selection.md)** ✅ COMPLETED
   - Structural facts move from associated constants to `&self` methods, so an
     enum can dispatch and an integrator can be chosen at runtime or named in a
     config file
   - **Dependencies**: None (pairs with Tolerances Trait)
   - **Effort**: Medium
+  - **Status**: `Method` and `MethodName` added; benches measured at -0.7% to
+    +0.4%, within criterion's noise threshold
 
 ### Callbacks
 
@@ -354,11 +356,11 @@ Each algorithm implementation should include:
 ## Progress Tracking
 
 Total Features: 41
-- Tier 1: 10 features (5/10 complete) ✅
+- Tier 1: 10 features (6/10 complete) ✅
 - Tier 2: 11 features (0/11 complete)
 - Tier 3: 20 features (0/20 complete)
 
-**Overall Progress: 12.2% (5/41 features complete)**
+**Overall Progress: 14.6% (6/41 features complete)**
 
 ### Completed Features
 1. ✅ BS3 (Bogacki-Shampine 3/2) - Tier 1 (2025-10-23)
@@ -366,5 +368,6 @@ Total Features: 41
 3. ✅ PID Controller - Tier 1 (2025-10-24)
 4. ✅ Rosenbrock23 - Tier 1 (2025-10-24)
 5. ✅ Tolerances Trait - Tier 1 (2026-09-30)
+6. ✅ Runtime Integrator Selection - Tier 1 (2026-09-30)
 
 Last updated: 2026-09-30