Release v0.5.0

What's Changed

• Return all matching API sources in recommended order, retaining test-directory
  deprioritization and preferring core/java/ among equally matching sources.
• Breaking: resolve now returns candidates instead of a single result;
  shared name resolvers return candidate arrays. Query and generation results
  include candidate metadata, and --source-path selects a matching source.
• Add a compact source picker inside the web search field using the shared
  Popover component. Preserve the selected source while editing references when
  it remains a candidate, and persist the selection in shared URLs.
• Isolate query caches by source path and invalidate previous query cache data.
• Replace unplugin-import-defer with native dynamic parser imports.
• Cache web Android version metadata for seven days in the ignored .cache
  directory, with an explicit cache version for invalidation.
• Update CLI documentation and the release-matched Skill for multi-source queries.
• Reorganize workspace packages at the repository root and manage the Skills
  dependency through the workspace catalog.