Bring the transport helpers back in line with project style:
- restore single-quote strings and docstrings;
- drop the oversized helper divider and simplify comments;
- keep guarded `match` dispatch so a missing `socket.AF_UNIX`
remains safe when `HAS_UDS` is false.
Also, format the `HAS_UDS` conjunction with the project's
multiline branch convention.
Review: PR #475 (goodboy)
https://github.com/goodboy/tractor/pull/475
Prompt-IO: ai/prompt-io/opencode/20260817T231825Z_359fe75c_prompt_io.md
(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))
Block the final user on its cached resource's `__aexit__()` and
raise regular cleanup errors at that user's ctx boundary.
Deats,
- serialize user registration and teardown under each cache-key lock
- keep queued entrants on the same lock through resource replacement
- preserve `Cancelled`, `KeyboardInterrupt`, and `SystemExit` flow
- cover successful, failing, cancelled, and re-entry teardown paths
Prompt-IO: ai/prompt-io/opencode/20260804T030309Z_65bf9df5_prompt_io.md
(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))
Gud Boi