[DO NOT MERGE - TEST ONLY] feat(sio2man): priority-ceiling sio2man, misses measurable (#340) - #356

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NathanNeurotic wants to merge 3 commits into

feat/340-sio2man-priority-ceiling

Commits on Aug 3, 2026

feat(sio2man): vendor a priority-ceiling sio2man to stop pad-read starvation (#340)

NathanNeurotic
and
claude
committed
c365744
diag(pad): count read misses for the Debug HUD (#340 test instrumentation)

NathanNeurotic
and
claude
committed
b270495
fix(sio2man): review hardening -- per-file deps, release guard, docs (#340)

NathanNeurotic
and
claude
committed
2f13f55