Structural history schema and Echo migration

[flyingrobots]

Summary

• add the schema-first Echo migration design packet and active backlog card
• retire the older Continuum structural reading port backlog card to graveyard now that the first port slice landed
• align NORTHSTAR, BEARING, and remaining structural WARP debt with the Graft-owned GraphQL schema / Wesley / Echo-primary direction

Verification

• pnpm lint
• pnpm test: blocked in Docker image metadata resolution for node:22-alpine; interrupted after several minutes before tests ran
• pnpm test:local: host Node 26 emits DEP0205 stderr and trips one stderr-empty assertion
• NODE_OPTIONS=--no-deprecation pnpm test:local: 220 files / 1604 tests passed

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (9)

• NORTHSTAR.md is excluded by !**/*.md
• docs/BEARING.md is excluded by !**/*.md
• docs/design/CORE_continuum-structural-reading-port.md is excluded by !**/*.md
• docs/design/CORE_structural-history-schema-and-echo-migration.md is excluded by !**/*.md
• docs/method/backlog/bad-code/CLEAN_remaining-structural-warp-reads-bypass-structural-reading-port.md is excluded by !**/*.md
• docs/method/backlog/dependency-dag.dot is excluded by !**/*.dot
• docs/method/backlog/dependency-dag.svg is excluded by !**/*.svg
• docs/method/backlog/up-next/CORE_structural-history-schema-and-echo-migration.md is excluded by !**/*.md
• docs/method/graveyard/CORE_continuum-structural-reading-port.md is excluded by !**/*.md

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cycle/CORE_structural-history-schema-and-echo-migration

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