Adopt workspaceFolders instead of deprecated RootPath/RootUri (stages 1 & 2)#1427

Draft

Copilot wants to merge 7 commits intomainfrom

copilot/fix-13540650-35509448-eb6f44c4-f5be-4d00-b6e1-171db2214d17

Commits on Nov 3, 2025

Initial plan
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Implement stages 1 & 2: adopt workspaceFolders instead of deprecated RootPath/RootUri

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baronfel
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Add comprehensive tests for workspaceFolders initialization

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baronfel
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Format code with fantomas to fix CI formatting errors

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baronfel
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Fix InitTest failure by respecting AutomaticWorkspaceInit setting

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baronfel
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Fix InitTest by preferring deprecated fields when AutomaticWorkspaceInit is false

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baronfel
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Addressing PR comments

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baronfel
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