chore: package config lint

[wenfix]

Summary

This branch adds package configuration linting to the monorepo. It adds publint and @arethetypeswrong/cli as dev dependencies, creates lint:exports, lint:types, and lint:package-config scripts in the root package.json, and adds a pre-commit hook to run lint:package-config. All packages now include attw and publint scripts.

This fixes highlighted issues related to package.json files, but left a few outstanding ones:

Outstanding issues:

• All packages have warnings about .d.mts files referenced in exports, but those files aren't generated. Fixing this requires build changes to emit separate type declarations for ESM and CJS.
• @metamask/multichain-ui has warnings about ESM files using .js extensions while "type": "commonjs" is set, causing incorrect interpretation. Fixing this requires renaming Stencil build outputs (e.g., .js to .mjs, .cjs.js to .cjs), which would need post-build scripts or Stencil configuration changes.
• The attw tool reports "FalseCJS" issues because .d.ts files are used for ESM imports when "type": "commonjs" is set, which also requires generating .d.mts files.

These issues require build system modifications and are deferred for future work.

References

Fixes WAPI-925

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes