The palette's Working now lists every running crew run on this repository with how long it has run, and choosing one opens it #7351

Intent: from any repository screen in the terminal you know who is working on it right now and can go and look.

Done:

• [ ] workingCommands (src/tui/screens/working.ts) returns one palette entry per running agent run the viewer may see (not only the first): Working now: <agent> on #N <summary> · 12 min.
• [ ] Choosing an entry opens that run's address the way the runs list does (openRunLog in src/tui/screens/runlist.ts), instead of a toast.
• [ ] A run on a sealed report the viewer may not see is still left out; no running run gives no entry, as today.
• [ ] A test (e.g. test/tui-working.test.ts) starts two runs, one on a sealed issue, and sees exactly one entry with its minutes; choosing it opens the run.

Files: src/tui/screens/working.ts, a new test.