[shimV2] add plan9 device controller#2641

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rawahars wants to merge 7 commits intomicrosoft:mainfrom

rawahars:plan9-dev-controller

Commits on Apr 5, 2026

Commits on Apr 7, 2026

review 2
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Commits on Apr 8, 2026

update build constraints in all the plan9 files
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refactor share state management to introduce StateInvalid for failed attempts
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refactor share management to remove GuestPath from Reserve API
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