fix(isl): filter stale worktrees with non-existent directories #46
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The WorktreeRemoveOperation used 'sl wt rm' but the actual subcommand is 'sl wt remove', causing 'abort: you need to specify a subcommand' when attempting to delete a worktree from the UI.
The worktree dropdown showed deleted worktrees because 'sl wt list' returns entries even after directories are removed from disk. Added server-side validation using exists() to filter out stale entries.
This was referenced Feb 9, 2026
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The worktree dropdown showed deleted worktrees because 'sl wt list'
returns entries even after directories are removed from disk. Added
server-side validation using exists() to filter out stale entries.
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