[Feature Request] Allow Claude to exit session programmatically via tool

Bug Description
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Feature Request: Allow Claude to exit the session programmatically

Current behavior:
The CLI only exits when the user types the literal command exit (and nothing else). If the user includes exit

Requested behavior:
Give Claude the ability to exit the harness when instructed to do so in natural language. This could be a tool

Why this matters:

• Open sessions create psychological friction — anxiety about unfinished work and loss of continuity
• Users naturally want to close loops with a final check ("anything else? if not, exit")
• Forcing users to send a separate literal "exit" command breaks conversational flow
• It's a small UX friction that compounds over many sessions

Suggested implementation:
Add a tool or capability that allows Claude to terminate the session when the user expresses intent to exit, rather than requiring the exact keyword match.

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.0.76
• Feedback ID: 8389a417-a590-4eb3-84e9-d5f0ed34b0c2