Context continuation summary messages repeatedly appear in conversation

When a conversation runs out of context and is continued in a new session, the system-reminder containing the previous conversation summary keeps appearing repeatedly on every turn. This includes old user messages (e.g., a quoted message from the prior session) that are shown to the user each time, which is confusing and disruptive.

Steps to reproduce

1. Have a long conversation that runs out of context
2. Continue the conversation in the same session (context continuation)
3. Observe that system-reminder content with old conversation quotes appears repeatedly on every exchange

Expected behavior

The summary should be loaded once and not visibly repeated to the user on every turn.

Environment

• macOS
• Claude Code CLI