diff --git a/codex/config.py b/codex/config.py
index 46e2fb7..ede21c8 100644
--- a/codex/config.py
+++ b/codex/config.py
@@ -134,59 +134,6 @@ class Settings(BaseSettings):
         ),
     )
 
-    # ------------------------------------------------------------------
-    # F-13 Synthesis / Lead-Engine
-    # ------------------------------------------------------------------
-    leads_dir: str = Field(
-        default="leads/",
-        description=(
-            "Directory where generated leads are written. "
-            "Grounded leads → leads/grounded/, conjectures → leads/conjectures/. "
-            "Relative paths are resolved from the current working directory."
-        ),
-    )
-
-    synthesis_llm_model: str = Field(
-        default="qwen2.5:7b",
-        description=(
-            "Ollama model name used for synthesis. "
-            "Must be available at the configured Ollama endpoint."
-        ),
-    )
-
-    synthesis_llm_url: str | None = Field(
-        default=None,
-        description=(
-            "Ollama base URL for synthesis. "
-            "When None, falls back to OLLAMA_BASE_URL."
-        ),
-    )
-
-    synthesis_top_k: int = Field(
-        default=20,
-        gt=0,
-        description="Number of top chunks retrieved per topic for synthesis.",
-    )
-
-    synthesis_min_grounded_ratio: float = Field(
-        default=0.5,
-        ge=0.0,
-        le=1.0,
-        description=(
-            "Minimum fraction of claims that must be grounded for a lead to be "
-            "emitted as grounded (not marked ⚠)."
-        ),
-    )
-
-    synthesis_gap_min_coverage: int = Field(
-        default=2,
-        gt=0,
-        description=(
-            "Minimum number of papers covering a topic before it is NOT flagged as a gap. "
-            "Topics with fewer papers → gap lead generated."
-        ),
-    )
-
     # ------------------------------------------------------------------
     # F-09 Rich Parsing
     # ------------------------------------------------------------------