Some minor rubocop appeasement

[jamis]

Incrementally working through removing rubocop:todo from the files.

[Copilot]

Pull request overview

This PR continues the incremental removal of rubocop:todo directives and applies RuboCop-driven style cleanups across build/test tooling and example scripts.

Changes:

• Cleans up Rakefile style (load path usage, task syntax, constant freezing) and adds/clarifies task descriptions.
• Modernizes gem/gemfile headers and formatting (frozen string literal, __dir__, quoting/require_relative style).
• Updates RuboCop configuration related to filename enforcement.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Rakefile	Removes rubocop:todo, refactors spec organization helper, adjusts load path usage and task definitions, adds task descriptions.
mongo.gemspec	Removes rubocop:todo, modernizes lib path resolution and formatting, adds MFA metadata.
gemfiles/zstd_compression.gemfile	Removes rubocop:todo, adds frozen string literal header and normalizes quoting/require_relative.
gemfiles/snappy_compression.gemfile	Removes rubocop:todo, adds frozen string literal header and normalizes quoting/require_relative.
gemfiles/mongo_kerberos.gemfile	Removes rubocop:todo, adds frozen string literal header and normalizes quoting/require_relative.
gemfiles/bson_min.gemfile	Removes rubocop:todo, adds frozen string literal header and normalizes quoting/require_relative.
gemfiles/bson_master.gemfile	Removes rubocop:todo, adds frozen string literal header and normalizes quoting/require_relative.
gemfiles/bson_4-stable.gemfile	Removes rubocop:todo, adds frozen string literal header and normalizes quoting/require_relative.
Gemfile	Removes rubocop:todo header.
examples/query.rb	Removes rubocop:todo and reformats queries.
examples/index.rb	Removes rubocop:todo and prints ok? status after index creation.
examples/delete.rb	Removes rubocop:todo header.
examples/create.rb	Removes rubocop:todo and reformats insert example (including zipcode as a string).
examples/aggregate.rb	Removes rubocop:todo and reformats aggregation pipelines.
.rubocop.yml	Disables Naming/FileName cop globally with an explanatory comment.

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