Native Qwen lifecycle reporting alongside session restore

[yiliang114]

Herdr now recognizes Qwen Code and persists its session identity through #2743. #2756 shows the remaining lifecycle gap: localized working and approval UIs can still be classified as idle.

Qwen Code has authoritative TUI state for working, blocked, and idle. A native reporter could remove the locale dependency, but the current ownership contract makes session restore and lifecycle reporting mutually exclusive when they use separate sources. Reusing one source would also couple two independent sequence producers and remove screen fallback for prompts not represented by the first reporter version.

Would Herdr support a paired Qwen integration contract with these properties?

• official session identity remains responsible for restore
• native TUI lifecycle has its own ordered reports and graceful release
• screen detection remains a fallback for visible blockers and older Qwen versions
• unrelated custom sources cannot share the session owner

This is the only Herdr-side prerequisite for a narrow Qwen TUI reporter. Orchestration and heterogeneous agents stay outside Qwen and continue through Herdr.

[yiliang114]

The Qwen-side implementation is now available as Draft PR QwenLM/qwen-code#9047. It is intentionally limited to TUI state/session reporting and graceful release, and remains Draft while the paired-owner contract here is unresolved.

I did not open a Herdr implementation PR under the contributor policy. A local end-to-end run with the minimal contract change observed idle → working → blocked → working → idle, preserved the session across /clear, and released lifecycle authority on /quit.