Separate serializable bindspace declarations from live namespace
identity, FDs, ownership and teardown resources.
Require child namespace entry during spawn bootstrap, before actor
runtime initialization, then distinguish listen/dial provisioning and
owned/borrowed cleanup without encoding operation role into maddrs.
Prompt-IO: ai/prompt-io/opencode/20260820T021516Z_dfad66a0_prompt_io.md
(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))
Gud Boi