lib-layers

Assign each lib a scope tag derived from its path, then declare allowed edges as commented lines in per-domain ESLint boundary config files. A missing import right is added explicitly with a reason rather than relying on an import that just worked.

Symbols about a subject live in that subject's domain; mechanics shared by several domains live in the family base, not a new domain. If the import is not permitted, either add the boundary line with a reason or move the symbol where both sides can see it.

Both export-from of a foreign module and the import-then-export pair hide the true origin of a symbol and bypass boundary checks. Barrels may only expose their own lib's files, via relative paths or the lib's own alias.

A cycle starts when a file imports its neighbor through the directory's index.ts, which itself re-exports the importing file. Break it with a direct file import, move shared types to their own file, or replace parent injection with a token.

Checks without tests can silently pass while doing nothing. Acceptance requires introducing a deliberate violation, watching the run turn red, then reverting the edit to prove the check actually fires.