Project engineering review

[NoneGG]

Fixes critical bugs and modernizes asyncio usage for improved robustness and compatibility.

This PR addresses several P0 issues identified in the project, including:

• Removing deprecated loop= parameters from asyncio calls to ensure compatibility with Python 3.8+.
• Correcting the await logic for asynchronous callbacks in pipelines.
• Fixing a potential infinite loop or non-execution bug in Cache.delete_pattern's SCAN cursor handling.
• Enhancing exception chaining in connection errors to preserve root causes.
• Improving the robustness of connection pool idle-check background tasks by ensuring proper scheduling and cancellation.
• Making connection pool disconnect() operations more idempotent.
• Updating PubSubWorkerThread to use concurrent.futures.wait instead of deprecated asyncio.wait(loop=...).

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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