Capture long tool responses in temporary storage and send pointers to the agent

[ptelang]

If the result of call_tool is a large payload:

• persist the large payload in temporary storage
• send a pointer to that payload in the response

Implement a new tool to allow the agent to read portions of the large response dynamically.
read_tool_response(resopnse_pointer, from_pos, to_pos, matching_expr)

This approach is similar in spirit to "Turning long tool responses into files" described in https://cursor.com/blog/dynamic-context-discovery.