Refs #4471, #3946. Read only admitted regular descriptors without blocking on pipes. Retain failed closes, join discovery workers, and propagate cancellation through CLI and MCP. Preserve command and descriptor cleanup as independent owners.
Refs #4471, #3946. Read only admitted regular descriptors without blocking on pipes. Retain failed closes, join discovery workers, and propagate cancellation through CLI and MCP. Preserve command and descriptor cleanup as independent owners.