Don't abort dump --subprocesses on non-Python children

[ravwojdyla]

• dump --subprocesses aborts on first non-Python child instead of skipping #846

• dump --subprocesses no longer aborts when a child isn't Python — bring it in line with record/top

• swap PythonSpy::new → PythonSpy::retry_new(..., 5) so a still-initializing child gets the same retry window the live samplers grant

• catch errors from the recursive write_traces call and warn! instead of ?-propagating ¹

• hoist the parentpid != pid skip above the separator writeln! so grandchildren no longer print a stray ----

• regression test: parent + python child + non-python sibling (sh -c 'sleep 3600'); asserts write_traces returns Ok, parent and python child appear, non-python child does not

Footnotes

1. matches Sampler::new_subprocess_sampler in src/sampler.rs — invisible by default, visible with RUST_LOG=warn ↩

[ravwojdyla]

Build / Test Wheels (3.8.0, windows-latest) (pull_request)Failing after 13s

That looks flaky to me ?