v0.4.1

Fixed

• MCPB bundle manifest — added the required server.mcp_config
  block (command: uv, args: --directory ${__dirname} run server/main.py, env wired to the manifest's user_config). The
  v0.4.0 release.yml run failed at the build-mcpb step because the
  @anthropic-ai/mcpb validator rejects manifests without
  mcp_config even for type: uv (the CLI is stricter than its own
  docs). All 0.4.0 features are unchanged; this is a release-pipeline
  fix only.
• scripts/build_mcpb.sh reads/writes the manifest with explicit
  encoding="utf-8" and ensure_ascii=False so running the build
  locally on Windows (default cp1252) doesn't mojibake the em-dash in
  display_name / long_description.