Add plugin compatibility tests for major CLI versions

[Nanle-code]

Summary:
Compatibility tests should verify that plugins continue to function across supported CLI versions and fail gracefully when they do not.

Why this matters:
Version mismatches are a common source of plugin failures and are difficult to diagnose without automated coverage.

Proposed work:

• Add tests for supported CLI/plugin compatibility ranges
• Validate failure output for incompatible plugin versions
• Document the compatibility policy for contributors

Acceptance criteria:

• Plugin compatibility is verified under test
• Incompatible versions produce clear messages
• The plugin ecosystem is easier to maintain

[probablyABug]

@probablyABug has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hi, i would like to work on this.

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[overprodigy]

@overprodigy has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I'd love ot work on this.

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Congratulations, @overprodigy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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[drips-wave]

This issue has been completed by @overprodigy as part of the Stellar Wave Program's 5th Wave 🥳

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