Why: The 2026-10-13 login flow plan requires a frozen contract record
(three adjudications against the r2 proposal) and a traceable task card
before implementation merges.
Evidence: doc-only commit; acceptance matrix cites backend/frontend test
files added in companion commits (SELF).
Impact: docs/svc-deploy/2026-10-13-login-recovery-contract.md becomes
the authoritative login-recovery contract; task card records user
authorization and requirement table L1-L9.
Refs: modules/documents/docs/proposals/2026-10-12-svc-unified-deploy-and-login-key.md r2
weichen
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