errors.ts: Add JSDoc for all exported error classes

[Kingsman-99]

Description

src/errors.ts defines the SDK's error class hierarchy but none of the classes have JSDoc explaining when they are thrown, what their fields mean, or how callers should handle them. This makes error handling documentation-poor for SDK consumers.

Acceptance Criteria

• Every exported error class has a JSDoc comment explaining when it is thrown
• Constructor parameters and public fields have inline /** */ comments
• At least one @example showing how to catch and inspect each error class
• Unit tests pass

Context

• Target file: src/errors.ts
• Documentation only; do not change class structure or inheritance

[lockoabosede8-byte]

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[chiscookeke11]

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Hello maintainer
Please I would like to work on this issue and get it done ASAP

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[Devdave-0x]

@Devdave-0x has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

can i work on this

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[grantfox-oss]

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

@Devdave-0x's PR #720 was approved and merged by @Kingsman-99.

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👏 Great work, @Devdave-0x! Keep contributing to Stellar-split.

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This issue has been completed by @Devdave-0x as part of the Stellar Wave Program's 8th Wave 🥳

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