Multithreading migration: Group 7 — 4 attribute-only + 2 Pattern B tasks#53118

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SimaTian wants to merge 13 commits intodotnet:mainfrom

SimaTian:merge-group-7

Commits on Feb 23, 2026

Address PR review: ManualResetEventSlim + Path.Combine + RuntimeGraph fix

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Fix CWD race: add [Collection] to serialize CWD-mutating tests

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Commits on Feb 24, 2026

Add TaskEnvironment lazy-init for merge-group-7 tasks

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Fix AbsolutePath combining constructor: normalize '..' segments

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