ctx.workspace registry owns WorkspaceId-branded records: realpath-
normalized unique paths (create rejects collisions; resolveByPath shares
the normalization), ordered sessionIds as the single source of ownership
truth, attachSession gated on the session header cwd matching the
workspace path (double-booking structurally impossible), dead session
ids filtered on projection and pruned on the next mutate, status()
reporting missing directories. No delete surface this phase — deletion
ships together with the session-side primitives as future work.
imccyu
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