T18-02-TASK-02 Add downstream publish-payload regression #546

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1. edithatogo

   added a parent issue on Aug 10, 2026

   • T18-02 Metadata duplication transport regression matrix #544
2. github-project-automation

   added this to Substack CLI frontier-mainline maturity programme to 1.0on Aug 10, 2026
3. github-project-automation

   moved this to Todo in Substack CLI frontier-mainline maturity programme to 1.0on Aug 10, 2026
4. edithatogo commented on Aug 10, 2026

   

   edithatogo

   on Aug 10, 2026

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   T18-02 completed in PR #548. Regression coverage verifies metadata behavior across preparation and serialized publish payloads. Evidence: 35 focused tests, 940 full tests, typecheck, contracts, governance, Biome CI, and all required hosted checks including Mutation passed. Merge SHA: 6c01495.
5. edithatogo

   closed this as completedon Aug 10, 2026
6. github-project-automation

   moved this from Todo to Done in Substack CLI frontier-mainline maturity programme to 1.0on Aug 10, 2026