Replace misleading V2PromotionEnabled/V2PromotionReady booleans with
single V2PromotionMode string: "disabled", "placeholder_fail_closed",
or "transport_ready".
Previous V2PromotionReady was true whenever any querier was installed,
including the placeholder that always returns error. Now the diagnostic
accurately distinguishes placeholder (fail-closed until proto regen)
from real gRPC transport.
blockV2EvidenceTransport bool on MasterServer tracks whether the real
transport querier is installed. Currently always false (placeholder).
Set to true only when real gRPC querier replaces the placeholder after
proto regen.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
pingqiuandClaude Opus 4.6
f825f08680