Problem

We need a "monitor the situation" mode/channel that shows cross-thread activity, especially:

• pending approvals
• waiting-for-user-input prompts
• threads with fresh output the user has not read yet

This should feel closer to Codex Desktop's global thread activity view.

Current Findings

• Codex App Server can list threads and report per-thread status plus updatedAt.
• Active thread flags currently include waitingOnApproval and waitingOnUserInput.
• The Thread schema does not expose a built-in global "unread" flag, so unread activity likely has to be inferred client-side (for example from updatedAt, latest turn/item ids, and local last-seen state).
• The plugin currently has no concept of a monitor channel or cross-thread event fan-out surface.

Proposed Scope

• Allow a channel/topic/thread to be bound as a monitor surface rather than a single-thread surface.
• Show pending approvals and pending questions with enough context to answer the right thread/request.
• Show "thread has unread activity" summaries and let the user jump into a dedicated Discord thread / Telegram topic for that Codex thread.
• Support detaching monitor mode with /codex_monitor off and compatible /codex_detach behavior.
• Track local last-seen state per Codex thread so unread detection is meaningful even though the App Server protocol does not provide a first-class unread bit.

Source Notes

• Thread list params: codex-rs/app-server-protocol/schema/typescript/v2/ThreadListParams.ts:7
• Thread list response: codex-rs/app-server-protocol/schema/typescript/v2/ThreadListResponse.ts:6
• Loaded-thread list response: codex-rs/app-server-protocol/schema/typescript/v2/ThreadLoadedListResponse.ts:5
• Thread schema includes updatedAt, status, cwd, name, but no unread field: codex-rs/app-server-protocol/schema/typescript/v2/Thread.ts:9
• Thread status active flags: codex-rs/app-server-protocol/schema/typescript/v2/ThreadStatus.ts:6
• Plugin thread listing client helper: src/client.ts:2503
• Plugin notification listener plumbing already exists: src/client.ts:2350