Root cause of 'No python processes found in process <pid>': py-spy needs
per-release ABI knowledge and 0.4.1 (latest PyPI) predates 3.14. Wrapper
now detects the interpreter and points users at pyinstrument/memray/cProfile.
New `profile` optional-deps group, opt-in Pyinstrument ASGI middleware
gated by DECNET_PROFILE_REQUESTS, bench marker + tests/perf/ micro-benchmarks
for repository hot paths, and scripts/profile/ helpers for py-spy/cProfile/memray.
