fix(codex): handle app-server approvals and idle completion

[0KABE]

This PR fixes codex app-server session handling in cc-connect by adding support for server-initiated approval requests and by improving turn completion detection for newer Codex versions.

Previously, the app-server adapter mainly handled client-initiated RPC requests and notifications. With newer Codex behavior, the server may also send approval requests that require a response, and turn completion may be signaled via thread status changes instead of only turn/completed. This patch updates the adapter to handle those cases correctly.

[chenhg5]

Review Summary

Solid implementation of server-initiated approval requests and improved turn completion detection for Codex app-server. The code is well-structured with proper concurrency handling.

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✅ Good:

1. Approval flow: Clean separation of pendingApprovals map with proper mutex protection. The goroutine-based timeout pattern (5min) with select on ctx/timer is correct.

2. Message type discrimination: The readLoop switch on hasID && !hasMethod / hasID && hasMethod / default is a clean way to distinguish responses, server requests, and notifications.

3. Turn completion deduplication: completeTurn() checks currentTurn and clears it atomically, preventing duplicate EventResult emissions.

4. thread/status/changed handling: Correctly detects codex 0.125+ idle status as turn completion signal.

5. Cleanup: rejectPendingApprovals() properly drains all pending channels on connection close.

6. Tool name mapping: handleApprovalRequest translates item/commandExecution/requestApproval → "Bash", item/fileChange/requestApproval → "Patch" for user-friendly display.

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💭 Observations (non-blocking):

• connect() now hardcodes --listen stdio:// instead of conditionally adding --listen when URL is set. This is correct for the stdio transport use case.
• handleDynamicToolCall returns a stub error response — appropriate for now since dynamic tools aren't supported.

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LGTM. CI green, well-tested pattern, addresses real Codex protocol evolution.