Add helper for building paginated response objects from a cursor and result set

[Chucks1093]

Summary

Every paginated endpoint constructs its response envelope (items, next_cursor, has_more) independently. A shared helper should produce a consistent paginated response shape so all endpoints return the same structure.

Scope

• Add buildPaginatedResponse<T>(items: T[], limit: number, cursorFn: (item: T) => string): PaginatedResponse<T>
• If items.length > limit, set has_more: true, pop the extra item, and set next_cursor to the cursor of the last kept item
• If items.length <= limit, set has_more: false and next_cursor: null
• Add unit tests for: exact limit, over limit, under limit, empty result set

Acceptance Criteria

• has_more: true and cursor set when results exceed limit
• has_more: false and cursor null when results at or below limit
• Empty result set returns has_more: false, empty items, null cursor
• Extra item not included in returned items array

ETA: 12 hours

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Coordinate on Telegram

[adeboladee]

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Hello Maintainer, Please I would like to work on this issue

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[KingDavid9999]

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Hi maintainer, I'd very much appreciate the opportunity to work on this issue.
Having reviewed the acceptance criteria, I'm confident that I'd be able to have a PR up shortly after being assigned.
Kindly assign this issue to me.
Thank you!

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[JamesVictor-O]

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Hello! I’d love to take on this issue. I’ve reviewed the requirements and have a clear path forward for the implementation. I estimate I can have a PR ready within about 3 hours of being assigned. Could you please assign this to me?

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[grantfox-oss]

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@JamesVictor-O's PR #615 was approved and merged by @Chucks1093.

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