[L6-ADR] ADR-0030 substrate gate evidence (backend unlocks only until H1)

[jason931225]

Lane L6-ADR (phase P6).
Objective: ADR-0030 substrate gate evidence (backend unlocks only until H1)
depends_on: ['L5-PAY', 'L2-API']
tip_serial: False
hold_touch: prepare-only:H1
Success: admit green + PR or stacked commit; path-disjoint allowlist; must_read first.
Transport: .grok/bin/mm-role → codex exec / claude -p.
Forbidden: docs/current/** edits as authority; multi-tip; Grok model: sol/claude; HOLD clearance by implication.

[jason931225]

Closing as completed by PR #618 (7b568df) and PR #755 (84655ce). The six ADR-0030 §7 backend substrate conditions now have live source and test evidence. This closes backend substrate evidence only; frontend, production, and release HOLDs remain.