feat: Context Management Tool

[akramcodez]

Description

Long-running sessions eventually hit the context window limit (FatalTurnLimitedError), forcing a full restart of the session.

Impact

• Loss of train of thought on complex tasks
• Inability to perform large-scale refactors requiring long context
• Wasted tokens re-reading the same information

Potential Fix

Introduce a ContextTool with commands to pin (keep), forget (drop), and summarize (compress to notes) items in the context window.

[Piyushrathoree]

let me handle this @akramcodez