After assignment executes through V2 core, evaluateActivationGate()
checks the resulting projection locally. If mode is degraded,
needs_rebuild, bootstrap_pending, or allocated_only, the volume is
gated from serving. Gate is enforced immediately after assignment,
before the next heartbeat round-trip.
Gate cleared only when projection reaches publish_healthy or
replica_ready. IsActivationGated() provides the query surface for
iSCSI/NVMe adapter enforcement. Heartbeat carries ActivationGated
and ActivationGateReason fields so master can observe the gated state
(report path, not enforcement path).
activationGated map on BlockService tracks per-volume gate state.
Initialized in constructor. Test helper updated to include it.
6 tests: degraded gates, needs_rebuild gates, healthy clears gate,
gate enforced before heartbeat, recovery re-enables, assignment with
degraded projection triggers gate.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
