[v1] Gate D artifact hardening for release evidence

[SMC17]

Problem
The v1 release needs this work to make the toolkit claim defensible.

Scope

• Make Gate D artifacts decision-grade for release evidence.
• Ensure live run outputs are schema-validated and operator guidance matches the artifacts.

Files

• scripts/gates/gate_d.sh
• docs/GATE_D_OPERATOR_RUNBOOK.md
• test_data/

Gates

• Gate D

Acceptance Criteria

• Artifacts include method status, latency, and schema validation results.
• Operator runbook matches actual env and artifact expectations.
• PROJECT_STATUS.md can point to a concrete live evidence path.

Related

• Epic: [Epic] v1 XRPL Toolkit release #45
• Milestone: v1 XRPL Toolkit