The gateway's dangerous command approval system was fundamentally broken:
the agent loop continued running after a command was flagged, and the
approval request only reached the user after the agent finished its
entire conversation loop. By then the context was lost.
This change makes the gateway approval mirror the CLI's synchronous
behavior. When a dangerous command is detected:
1. The agent thread blocks on a threading.Event
2. The approval request is sent to the user immediately
3. The user responds with /approve or /deny
4. The event is signaled and the agent resumes with the real result
The agent never sees 'approval_required' as a tool result. It either
gets the command output (approved) or a definitive BLOCKED message
(denied/timed out) — same as CLI mode.
Queue-based design supports multiple concurrent approvals (parallel
subagents via delegate_task, execute_code RPC handlers). Each approval
gets its own _ApprovalEntry with its own threading.Event. /approve
resolves the oldest (FIFO); /approve all resolves all at once.
Changes:
- tools/approval.py: Queue-based per-session blocking gateway approval
(register/unregister callbacks, resolve with FIFO or all-at-once)
- gateway/run.py: Register approval callback in run_sync(), remove
post-loop pop_pending hack, /approve and /deny support 'all' flag
- tests: 21 tests including parallel subagent E2E scenarios
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