This fixes #73.

Summary:

• fall back to the monorepo root react-doctor.config.json / package.json#reactDoctor when scanning a workspace package that does not have its own local config
• keep package-local config higher priority than the monorepo root fallback

Why:

• the CLI selects workspace packages from the repo root, but each scan runs from the package directory
• previously loadConfig() only checked the package directory itself, so root-level config was ignored for workspace package scans

Changes:

• extracted per-directory config loading into a helper
• updated loadConfig() to:
  • return local config first
  • otherwise detect the monorepo root and load config from there as a fallback
• added tests covering:
  • monorepo root fallback
  • local package config precedence over root config

Validation:

• pnpm build
• pnpm exec vitest run tests/load-config.test.ts --reporter=dot
• manual CLI repro with a temporary monorepo confirmed that a root-level ignore rule now applies to a workspace package scan