- Install eslint-plugin-boundaries@^4.2.2 to enforce three-tag boundary model - Configure element types: app, core-composition (core-api/core-cms), core, feature, tooling - Enforce unidirectional dependency graph: apps→features→core, core-composition→features - Add eslint.config.js to all 17 packages and apps (required for ESLint 9 flat config) - Fix pre-existing linting issues to achieve clean lint pass Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>