Consolidate Odysseus agent harness and tool contracts

src/model_context.py

@@ -148,6 +148,10 @@ KNOWN_CONTEXT_WINDOWS = {
     'deepseek-v3': 64000,
     'deepseek-v2': 64000,
     'deepseek-v4': 64000,
+    # Provider aliases used by configured Odysseus endpoints may omit the
+    # generation name. Keep them out of the unknown/small-model fallback,
+    # which otherwise trims multi-turn tool history to ~1K tokens.
+    'deepseek-flash': 64000,
 
     # --- Google ---
     'gemini-2.5-pro': 1048576,