Slate Interfaces API Ledger

• owner: packages/slate
• tranche: 3
• rule: restore same-path interface truth before example or runtime patches

Current Read

• interfaces-family deleted-test closure is already banked
• CustomTypes stays explicit skip under the current structural typing claim
• package-local interface recovery for slate is closed
• interfaces/node.ts is now partially pulled back toward legacy by routing child traversal through the recovered getChildren seam instead of assuming raw children access everywhere
• interfaces/path.ts, interfaces/point.ts, interfaces/range.ts, and the path/point/range ref files are now pulled back toward the legacy source shape without changing the green fixture surface
• direct non-Editor interface oracle proof is now live and green in:
  • .tmp/slate-v2/packages/slate/test/legacy-interfaces-fixtures.ts
• package-local closeout is green on:
  • bun test ./packages/slate/test
  • bunx turbo build --filter=./packages/slate
  • bunx turbo typecheck --filter=./packages/slate
  • bun run lint:fix
  • bun run lint
• tranche-3 interface/bookmark seams are now landed:
  • interfaces-contract.ts
  • interfaces/bookmark.ts
  • root Bookmark* exports

Sources

• 2026-04-18-slate-v2-slate-claim-width-classification.md
• 2026-04-09-slate-v2-interfaces-family-deleted-test-closure.md

Tranche 3 Rule

• legacy exported interface width wins by default
• do not revive CustomTypes declaration-merging width by accident
• do not let the current narrower structural typing story win automatically just because it ships today
• recover same-path exported interface truth before consumer patches or example cleanup
• restored direct interface-fixture owners outrank source closeness when they disagree