fix: clear before cursor when advancing pagination

[Shubham-Padkonde]

Description

When auto-pagination starts from a before cursor, subsequent requests currently contain both the original before and the new after cursor. Remove before from the copied parameters when advancing, for both sync and async clients. The first request and the caller's original parameters remain unchanged, and other query filters are preserved.

The change is limited to the hand-maintained base client and pagination tests. Both new HTTP regression tests fail before the fix. All 2,883 tests pass afterward; Ruff and git diff --check pass.

Documentation

No documentation changes required; this restores forward auto-pagination using the existing API.

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Fixes pagination cursor handling when moving forward.

The PR appears safe to merge.

Summary

The PR removes the initial before cursor from subsequent forward-pagination requests in both clients while retaining other filters and leaving caller parameters unchanged. New HTTP tests verify the request parameters for sync and async pagination.

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