Nothing consumed GitWorktreeInfo.locked: a locked worktree is a real checkout
and stays a usable workspace, so no caller needs to distinguish it. Unknown
porcelain keys are already ignored, so parsing it was speculative.
The parser test still feeds a real `locked` line and asserts it is ignored, and
the service test still pins that a present, non-prunable worktree is kept, so
the policy stays covered without the field.
git worktree list keeps reporting a linked worktree after its directory is deleted
outside PI WEB, marking it prunable. The workspace list showed those as normal
selectable workspaces. The porcelain parser now reads the prunable and locked keys,
and WorkspaceService filters prunable linked worktrees out while always keeping the
project's own path. Listing stays read-only; git worktree prune is never run.
Federico Jaramillo Martinez