Code style improvements.
    
    * wip/maintenance/code-style:
      Correct over-long lines.
      Explicitly enumerate items exported from the ‘daemon’ package.
      Align closing bracket syntax with first line.
      Correctly separate in-line comments.
      Correct syntax for defining dictionary values.
      Correct a typographical error.
      Remove unused name bindings.
      Correct idiom for identity comparator.
      Correct ordering of import statements.
      Remove unused imports.
      Correct expected blank lines.