Moving Darwin sockets to `/tmp/tractor-<uid>` left pytest and the
standalone reaper searching only `XDG_RUNTIME_DIR`. Enabling that
shared bindspace naively would also let automatic session cleanup
unlink an independent live `registry@1616.sock`.
Resolve the runtime's actual default UDS bindspace on every platform.
Exclude the pid-less registry sentinel from automatic cleanup while
retaining explicit CLI removal, and document that destructive choice.
Cover bindspace resolution and automatic-vs-explicit sentinel policy.
Review: PR #480 (goodboy)
https://github.com/goodboy/tractor/pull/480
(this patch was generated in some part by `opencode` using
`gpt-5.6-sol` (`openai`))
Gud Boi
16dd876b0c