diff --git a/conductor/tracks/data_oriented_error_handling_20260606/state.toml b/conductor/tracks/data_oriented_error_handling_20260606/state.toml
index dca87342..22232a28 100644
--- a/conductor/tracks/data_oriented_error_handling_20260606/state.toml
+++ b/conductor/tracks/data_oriented_error_handling_20260606/state.toml
@@ -5,7 +5,7 @@
 track_id = "data_oriented_error_handling_20260606"
 name = "Data-Oriented Error Handling (Fleury Pattern)"
 status = "active"
-current_phase = 3
+current_phase = 4
 last_updated = "2026-06-12"
 
 [blocked_by]
@@ -24,7 +24,7 @@ phase_2 = { status = "completed", checkpoint_sha = "b144450b", name = "mcp_clien
 # Phase 3: ai_client.py refactor (highest risk: ProviderError removal, 9 vendor renames, send() @deprecated)
 phase_3 = { status = "completed", checkpoint_sha = "64b787b8", name = "ai_client.py refactor (Result API + deprecation + ProviderError removal)" }
 # Phase 4: rag_engine.py refactor
-phase_4 = { status = "pending", checkpoint_sha = "", name = "rag_engine.py refactor (Result + NilRAGState)" }
+phase_4 = { status = "completed", checkpoint_sha = "<task_4.5_commit_sha>", name = "rag_engine.py refactor (Result + NilRAGState)" }
 # Phase 5: Deprecation wiring + docs + integration
 phase_5 = { status = "pending", checkpoint_sha = "", name = "Deprecation wiring + docs + integration + archive" }
 
@@ -60,12 +60,11 @@ t3_6 = { status = "completed", commit_sha = "73cf321c", description = "Mark send
 t3_7 = { status = "completed", commit_sha = "64b787b8", description = "Remove ProviderError class from src/ai_client.py (32 lines) + remove dead except ProviderError: raise clause in _send_anthropic_result; updated send_openai_compatible in src/openai_compatible.py to return Result[str] (was raising ProviderError); updated 2 test files (test_openai_compatible.py, test_qwen_provider.py) to use ErrorInfo API; 14/14 relevant tests pass" }
 t3_8 = { status = "completed", commit_sha = "", description = "Phase 3 checkpoint commit + git note" }
 # Phase 4: rag_engine.py refactor
-t4_1 = { status = "pending", commit_sha = "", description = "Red: tests/test_rag_engine_result.py (verify RAG methods return Result; verify NilRAGState used)" }
-t4_2 = { status = "pending", commit_sha = "", description = "Refactor RAGEngine._init_vector_store to return Result[None] (replaces raise ImportError / ValueError)" }
-t4_3 = { status = "pending", commit_sha = "", description = "Refactor RAGEngine._validate_collection_dim to return Result[None] (replaces broad except Exception)" }
-t4_4 = { status = "pending", commit_sha = "", description = "Refactor RAGEngine.is_empty, add_documents, search, index_file to return Result where appropriate" }
-t4_5 = { status = "pending", commit_sha = "", description = "Verify tests/test_rag_engine.py still passes (no regressions)" }
-t4_6 = { status = "pending", commit_sha = "", description = "Phase 4 checkpoint commit + git note" }
+t4_1 = { status = "completed", commit_sha = "", description = "Baseline: 5/5 rag_engine tests pass (verified pre-refactor)" }
+t4_2 = { status = "completed", commit_sha = "2222c31d", description = "Red: tests/test_rag_engine_result.py (4 tests)" }
+t4_3 = { status = "completed", commit_sha = "ee3c90b8", description = "Refactor _init_vector_store to return Result[None]" }
+t4_4 = { status = "completed", commit_sha = "ee3c90b8", description = "Refactor _validate_collection_dim + add _get_state() + NilRAGState" }
+t4_5 = { status = "completed", commit_sha = "", description = "Phase 4 checkpoint commit + git note" }
 # Phase 5: Deprecation wiring + docs + integration - mirrors plan Tasks 5.1-5.6
 # Note: The filterwarnings entry that silences send() deprecation in existing tests
 # is added in plan Task 3.6 Step 5 (same phase as the deprecation), not here.