host-daemon: give unanswered user questions a ten-minute deadline

[DarrenTsung]

Problem

A native user-question request — claude-code's AskUserQuestion forwarded over interaction/request — registers with the server and then resolves only when a client answers or the provider exits. With nobody watching the thread, the registerAndWait promise never settles: the turn never ends and the human's typed replies queue behind it (measured: a question pending 2h30m, the reply delivered 13 minutes later as an abort).

The plugin interaction path (bb.ui.requestInput) already defaults to a ten-minute timeout; the native path has none (expiresAt: null).

Fix

InteractiveRequestRegistry.registerAndWait now arms a ten-minute deadline for user_question payloads (approvals keep their current behavior). On expiry the entry is dropped and rejected with interactive_request_timeout, which propagates to the provider bridge as a JSON-RPC error and resolves the tool call as a denial telling the model to ask in prose instead — one wasted turn instead of a multi-hour hang. A new onTimeout option (wired in app.ts to the existing interactive-interrupt push) marks the server row interrupted so the thread is not left stuck "already awaiting user interaction".

Tests

• interactive-request-registry.test.ts: rejects an unanswered user question at the deadline (fails on the old code — the promise never settles), applies no deadline to approvals, clears the deadline when answered in time, and does not time out a question whose registration failed.
• Full @bb/host-daemon suite (586 tests) and typecheck pass.

[DarrenTsung]

Oops, I didn't even realize my agent would create this. But yeah I've had a few bb threads stuck behind a AskUserQuestion that never resolved and got interrupted for some reason. So I couldn't even answer the question when I realized the thread was waiting for me, needed a manual stop and new message to bump the thread.