Gud Boi b8f243e98d Impl min-viable `subint` spawn backend (B.2) ... Replace the B.1 scaffold stub w/ a working spawn flow driving PEP 734 sub-interpreters on dedicated OS threads. Deats, - use private `_interpreters` C mod (not the public `concurrent.interpreters` API) to get `'legacy'` subint config — avoids PEP 684 C-ext compat issues w/ `msgspec` and other deps missing the `Py_mod_multiple_interpreters` slot - bootstrap subint via code-string calling new `_actor_child_main()` from `_child.py` (shared entry for both CLI and subint backends) - drive subint lifetime on an OS thread using `trio.to_thread.run_sync(_interpreters.exec, ..)` - full supervision lifecycle mirrors `trio_proc`: `ipc_server.wait_for_peer()` → send `SpawnSpec` → yield `Portal` via `task_status.started()` - graceful shutdown awaits the subint's inner `trio.run()` completing; cancel path sends `portal.cancel_actor()` then waits for thread join before `_interpreters.destroy()` Also, - extract `_actor_child_main()` from `_child.py` `__main__` block as callable entry shape bc the subint needs it for code-string bootstrap - add `"subint"` to the `_runtime.py` spawn-method check so child accepts `SpawnSpec` over IPC Prompt-IO: ai/prompt-io/claude/20260417T124437Z_5cd6df5_prompt_io.md (this patch was generated in some part by [`claude-code`][claude-code-gh]) [claude-code-gh]: https://github.com/anthropics/claude-code		2026-04-23 18:47:49 -04:00
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claude	Impl min-viable `subint` spawn backend (B.2)	2026-04-23 18:47:49 -04:00
prompts	Restore fn-arg `_runtime_vars` in `trio_proc` teardown	2026-04-23 18:30:11 -04:00