fix bundle + incr provided buffers

[wokron]

axboe/liburing#1566

[Copilot]

Pull request overview

This PR adjusts bundled provided buffer handling for incremental buffer rings, aligning queue/pool bookkeeping with partial buffer consumption behavior.

Changes:

• Tracks buffer ring registration flags in provided buffer queue/pool internals.
• Updates bundled incremental completion handling to distinguish fully consumed buffers from partial tails.
• Expands tests for bundled incremental queue/pool behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
include/condy/provided_buffers.hpp	Updates bundled provided buffer queue/pool state handling for incremental buffer rings.
tests/test_buffers.cpp	Adjusts unit expectations for bundled incremental queue/pool consumption.
tests/test_async_operations.1.cpp	Adds async coverage for subsequent bundled incremental receives and partial-tail behavior.

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