Close the SDD cycle for the ring architecture replacement: verified
with one critical (channel silence by omission) fixed and re-checked
before archive, delta merged into the main native-alarms spec (2
requirements removed, 5 added), artifacts archived byte-for-byte.
Phase 3 on-device QA (9 items) remains the mandatory human gate.
Close the SDD cycle: verified pass with warnings (0 critical), slice 1
cancelled with SDK evidence, slices 2-3 shipped, post-verify dispose
fix landed. The native-alarms capability spec is promoted to
openspec/specs/ with the corrected FGS requirement. Phase 5 on-device
QA remains the pending human gate.