NexusInDesign 4.2.0

Changed

• English by default, French on a French Windows: the MCP instructions, tool titles and descriptions
  (native/tool-contracts.json in English, native/tool-contracts.fr.json for French), results, errors and the UXP
  scripts' own messages follow the Windows display language. The doctor's registry hash stays language-neutral.
• Build output path taken from the .NET user profile instead of $(USERPROFILE), which is unset on Dependabot's Linux
  runner (NuGet restores silently failed on /.nexus).
• Strict build: recommended .NET analyzers, code style enforced, warnings as errors (.editorconfig added).
• JsonSchema.Net 9.6.0.
• Release workflow on NexusSystem's shared workflows v1.6.54, pinned by commit SHA.
• CodeQL runs from .github/workflows/codeql.yml (actions, C#, JavaScript/TypeScript, default queries) instead of the
  default setup, so OpenSSF Scorecard credits SAST for commits pushed without pull requests.
• CHANGELOG compare links for every released version.