The profile was captured against the spin-enabled build. With the RFC 004
spinning experiment excised from master, the ~12% hot-path futex_wake it
attributed to the spinning submit-rule no longer exists (idle wait is back to
thread::sleep). Add a provenance note, mark the futex_wake row/finding as
excised spin machinery, and drop the now-moot 'gate the submit wake' lead.
Spin-independent findings (shims ~1%, schedule_loop + run-queue ~33%) unchanged.
smarm-agent