docs(common): update constitution for UI Kit extraction

[pasevin]

Summary

Updates the UI Builder constitution (v1.2.2 → v1.3.0) to reflect the UI Kit extraction to the openzeppelin-ui monorepo.

Changes

• Section I: Core packages now external (@openzeppelin/ui-* from openzeppelin-ui repo); only builder app and adapters remain in this repo
• Section II: logger now from @openzeppelin/ui-utils
• Section III: Changesets now only for builder app and adapters; core packages versioned independently
• Section IV: Styling via @openzeppelin/ui-styles; cn from @openzeppelin/ui-utils
• Section V: Exported apps use @openzeppelin/ui-* packages with documented version strategy
• Section VII: Interface changes require coordination with openzeppelin-ui maintainers
• Additional Constraints: Types source of truth now @openzeppelin/ui-types; utilities from @openzeppelin/ui-utils
• Development Workflow: Added pnpm dev:local / pnpm dev:npm for local UI development; added pnpm docker:dev

Related

• Follows spec 007-ui-kit-extraction