fix: kill ghost agent processes on Ctrl+C#27

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malpou wants to merge 7 commits into

computerlovetech:mainfrom

malpou:pm/ghost-agent-cleanup

Commits on Mar 22, 2026

feat: add process group kill helper for agent subprocess cleanup

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feat: add process group isolation to streaming agent subprocess

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feat: add process group isolation to blocking agent subprocess

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test: add process group cleanup and isolation tests

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refactor: consolidate process group tests to reduce PR diff

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refactor: use timeout_proc helper to reduce blocking test boilerplate

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refactor: consolidate process group test classes and trim docstrings

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