Multithreading migration: Group 9 — 4 Package/Asset tasks (Pattern B)#53120

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SimaTian wants to merge 10 commits intodotnet:mainfrom

SimaTian:merge-group-9

Commits on Feb 22, 2026

Commits on Feb 23, 2026

Address PR review: remove (string) cast, add null! initializer

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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-9 tasks

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Fix AbsolutePath combining constructor: normalize '..' segments

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Commits on Feb 25, 2026