Last assistant message re-displays on context compression/session re-initialization

Description

When a session's context window gets compressed mid-conversation, the last assistant message is re-printed/re-displayed to the user. This creates a repetitive experience — especially in long sessions where compression happens multiple times, the same message keeps appearing.

Steps to Reproduce

1. Start a long conversation in Claude Code
2. Continue the conversation until context compression triggers
3. Observe: the last assistant message is reprinted verbatim before the session continues

Expected Behavior

The session should resume without re-displaying the last assistant message. The user already saw it — reprinting it adds no value and creates a jarring experience, especially when it happens repeatedly in the same session.

Actual Behavior

The last assistant message is re-displayed every time the session re-initializes or context is compressed. In a long session this can happen multiple times, showing the same block of text over and over.

Environment

• Claude Code CLI (macOS)
• Opus 4.6 (1M context)
• Long-running sessions with multiple tool calls