feat: add stop/start instance to client

[jason-lynch]

Summary

Adds StopInstance and StartInstance to the client package. These endpoints have existed for a while, but were missing from this package.

Testing

Nothing uses this currently.

Summary by CodeRabbit

• New Features
  • Added the ability to start instances.
  • Added the ability to stop instances.

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📝 Walkthrough

Walkthrough

Two new methods, StopInstance and StartInstance, are added to the Client interface and implemented in SingleServerClient and MultiServerClient. SingleServerClient delegates to the underlying API client with error translation, while MultiServerClient delegates to the live server instance.

Changes

Cohort / File(s)	Change Summary
Start/Stop Instance Methods client/interface.go, client/multi.go, client/single.go	Added StopInstance and StartInstance method signatures to Client interface; implemented in SingleServerClient with c.api delegation and translateErr error handling; implemented in MultiServerClient with liveServer delegation

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 New methods hop into view, start and stop with grace,
Delegating through servers at a steady pace,
Clean patterns repeated across the files with care,
Instances rise and rest—now the clients are aware! 🎉

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is missing several required template sections including Changes, Testing details, Checklist items, and Notes for Reviewers.	Complete the PR description by adding the Changes section with bulleted list, detailed Testing commands/steps, marking all Checklist items, and adding Notes for Reviewers if applicable.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding stop/start instance functionality to the client package, following Conventional Commits format.

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[jason-lynch]

@coderabbitai review

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[rshoemaker]

👍