fix: let request-help return structured timeout outcomes

[giattijunior]

Problem

request-help passes its user-facing timeout to the generic per-session queue. When no human action occurs, the extension's timer and the daemon queue timeout race at the same deadline; the queue can return a generic RPC timeout before the extension returns the documented timed_out result.

Fix

Give only tool.request_help one second of daemon-side response grace. The original timeout_ms remains unchanged in the extension-facing params, so the user-visible deadline is preserved. Other tools keep their existing timeout behavior.

Validation

• git diff --check passes.
• Reproduced on CLI 0.1.11: bsk request-help --timeout 5s returned generic RPC timeout.
• Confirmed the structured completion path with valid completion-criteria.
• Cargo tests could not be run in the validation environment because Rust/Cargo is not installed.