stacker agent status / stacker agent health resolve different "active" deployments for the same project

[vsilent]

Summary

When a project has more than one deployment (e.g. one to a cloud server, one to an existing server), running stacker agent status and stacker agent health without --deployment can resolve to different "active" deployments for the same project, giving contradictory results in the same session.

Steps to reproduce

1. Deploy the same project twice to different targets, e.g.:

   stacker deploy --target server --watch      # deployment A
   stacker deploy --target cloud --key htz-0 --force-new --watch   # deployment B

2. Run stacker agent status (no --deployment flag). Note the deployment hash it auto-selects (printed as "using active agent for project '': ").
3. Immediately run stacker agent health (no --deployment flag). Note the deployment hash it auto-selects.

Observed

In our case (project ntfy, id=551):

• stacker agent status resolved to deployment_5bac5017... (the newer, completed cloud deployment) — reported the app running correctly.
• stacker agent health resolved to deployment_f27d9440... (an older, paused/broken existing-server deployment) — reported Overall: degraded, with the app container stuck in created state.

Passing --deployment <hash> explicitly to either command works correctly and both agree once resolved to the same value — the bug is only in the "no --deployment given" auto-resolution path.

Expected

Both commands should apply the same "pick the active deployment for this project" rule (e.g. most recent, or most recently successful/non-paused), so status and health never disagree about which deployment they're describing.

Impact

Confusing/contradictory output makes it hard to trust the "no flag" convenience path — a user could see health reporting "degraded" for what is actually a healthy, currently-serving deployment, because it silently picked a stale one.

Environment

• stacker CLI 0.3.1 (fbffb9e)
• Reproduced while testing stacker-projects/ntfy in trydirect/stacker-project-examples