Finished bs3 (at least for now)

roadmap/README.md

@@ -28,7 +28,7 @@ Each feature below links to a detailed implementation plan in the `features/` di
 
 ### Algorithms
 
-- [ ] **[BS3 (Bogacki-Shampine 3/2)](features/01-bs3-method.md)**
+- [x] **[BS3 (Bogacki-Shampine 3/2)](features/01-bs3-method.md)** ✅ COMPLETED
   - 3rd order explicit RK method with 2nd order error estimate
   - Good for moderate accuracy, lower cost than DP5
   - **Dependencies**: None
@@ -327,8 +327,13 @@ Each algorithm implementation should include:
 ## Progress Tracking
 
 Total Features: 38
-- Tier 1: 8 features (0/8 complete)
+- Tier 1: 8 features (1/8 complete) ✅
 - Tier 2: 12 features (0/12 complete)
 - Tier 3: 18 features (0/18 complete)
 
-Last updated: 2025-01-XX
+**Overall Progress: 2.6% (1/38 features complete)**
+
+### Completed Features
+1. ✅ BS3 (Bogacki-Shampine 3/2) - Tier 1
+
+Last updated: 2025-10-23