[PeerX Backlog # 94] Surface healthcheck endpoint in CLI

[ameeribro4-sudo]

Problem Statement
The peerx CLI doesn't expose pre-flight health checks (admin
reachable, contract paused, oracle fresh).

Acceptance Criteria

• peerx health subcommand exits 0/1/2 with structured output.
• Documented.

Files Affected

• peerx-cli/.

Difficulty / Effort 🥈 / S
Labels observability, dx

[coderolisa]

Hello Maintainer,

I'd like to work on this issue. I've reviewed the requirements and can complete the implementation as specified.

Please assign it to me. Thank you!

[grantfox-oss]

🦊 GrantFox — @coderolisa has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #94)
2. Your PR will be reviewed by the OpenPeerX maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@coderolisa's PR #113 was approved and merged by @ameeribro4-sudo.

🏆 @coderolisa: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,089 total points). Track your full progress on GrantFox.

👏 Great work, @coderolisa! Keep contributing to OpenPeerX.