DX: AB5000 'another dev process owns this project' should include the owning server's URL #125

Summary

agent-bundle dev on a project already owned by another dev process fails with:

[{"code":"AB5000","message":"Another agent-bundle dev process owns this project (pid 156163).","severity":"error"}]

The pid is enough to kill the other process, but the common case is wanting to reuse it — and the message gives no way to find it. I had to dig the port out of ss -tlnp (users:(("node",pid=156163,…))) to discover the existing workbench at 127.0.0.1:48721.

Suggestion

The owner already persists enough state to enforce the lock; include its loopback URL (and maybe start time) in the AB5000 payload, e.g.

Another agent-bundle dev process owns this project (pid 156163, http://127.0.0.1:48721, started 41m ago).

That turns a dead end into a one-click reuse, especially for agents driving the workbench programmatically.

Observed on preview 560124af.