diff --git a/TODO.md b/TODO.md
index d996ae5..aa1066d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,11 +4,11 @@ Dispatched from core/go orchestration. This package is minimal by design.
 
 ---
 
-## Phase 1: Foundation
+## Phase 1: Foundation — `d76448d` (Charon)
 
-- [ ] **Add tests for option application** — Verify GenerateConfig defaults, all With* options, ApplyGenerateOpts/ApplyLoadOpts behaviour.
-- [ ] **Add tests for backend registry** — Register, Get, List, Default priority order, LoadModel routing.
-- [ ] **Add tests for Default() platform preference** — Verify metal > rocm > llama_cpp ordering.
+- [x] **Add tests for option application** — Verify GenerateConfig defaults, all With* options, ApplyGenerateOpts/ApplyLoadOpts behaviour. Comprehensive API tests (1,074 LOC).
+- [x] **Add tests for backend registry** — Register, Get, List, Default priority order, LoadModel routing.
+- [x] **Add tests for Default() platform preference** — Verify metal > rocm > llama_cpp ordering.
 
 ## Phase 2: Integration