Plan Review needs no worktree, so it runs rooted at the project root. The
activeSessionRegistry key was the bare root path, so the second task to reach
Plan Review hit ActiveSessionPathHeldByForeignTaskError ("path ... is held by
task FN-1398; task FN-1403 may not overwrite it"). That surfaced as a Plan
Review provider failure, burned the in-place retry budget against a hold no
retry could clear, and left the task parked.
Task-scope the registry key for any session rooted at rootDir, in every project
mode — the workspace fix already did this for the shared browse-root. Root
exclusivity protects nothing here: write-capable nodes are refused at the root
outright, and every isPathActive consumer guards removable worktree paths.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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