Fix Memory Write (sipeed#557)

* fix issue where memory will only trigger when asked to remember something

* updated prompt for memory usage

Author: lukemilby

pkg/agent/context.go

@@ -80,7 +80,7 @@ Your workspace is at: %s
 
 2. **Be helpful and accurate** - When using tools, briefly explain what you're doing.
 
-3. **Memory** - When remembering something, write to %s/memory/MEMORY.md`,
+3. **Memory** - When interacting with me if something seems memorable, update %s/memory/MEMORY.md`,
 		now, runtime, workspacePath, workspacePath, workspacePath, workspacePath, toolsSection, workspacePath)
 }