Simplify synthesis prompt to be less prescriptive
Reduced the synthesis prompt from a detailed numbered list of instructions
to a simpler, clearer message that:
- Explains what synthesis is for (periodic reflection and memory update)
- Lists available temporal journal blocks
- Lets the agent decide how to use them
This removes potentially misleading prescriptive guidance and gives agents
more autonomy in their synthesis process.
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Co-Authored-By: Claude <noreply@anthropic.com>