Bug Description:

Since the migration to Claude Agent SDK, we incorrectly edit messages.
See https://docs.claude.com/en/api/agent-sdk/sessions

Steps to Reproduce:

1. Have a conversation with @ClaudeCode
2. Edit a message
3. Observe Claude Code has all messages in context (also the old edited one)

Additional Information

• Operating System: Any
• Theia Version: 1.66 prerelease