Fix compacted tool history for resumed sessions

src/compact.py

@@ -22,7 +22,7 @@ from typing import TYPE_CHECKING, Any
 
 from .agent_context_usage import estimate_tokens
 from .agent_types import UsageStats
-from .agent_session import AgentMessage
+from .agent_session import AgentMessage, sanitize_model_message_sequence
 
 if TYPE_CHECKING:
     from .agent_runtime import LocalCodingAgent
@@ -522,7 +522,7 @@ def compact_conversation(
         )
 
     candidates = list(session.messages[prefix_count:compact_end])
-    preserved_tail = list(session.messages[compact_end:])
+    preserved_tail = sanitize_model_message_sequence(list(session.messages[compact_end:]))
 
     if not candidates:
         return CompactionResult(