fix: Hash-like Collection methods return Collections

[silug]

Fixes #37

[Copilot]

Pull request overview

This PR addresses Issue #37 by making ComplianceEngine::Collection’s Hash-like filtering methods return ComplianceEngine::Collection objects (instead of plain Hashes), and bumps the library/module version accordingly.

Changes:

• Update ComplianceEngine::Collection so select/reject return Collections, and add/adjust related Hash-like iteration helpers.
• Add RSpec coverage to assert Ces#select/#reject return ComplianceEngine::Ces instances and don’t mutate the original.
• Bump version to 0.3.0 and document the change in the changelog.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
lib/compliance_engine/collection.rb	Changes Hash-like methods (select/reject) to return Collections; adds values; adjusts enumerator behavior for each variants; adds transform_values.
spec/classes/compliance_engine/ces_spec.rb	Adds specs asserting select/reject return the same Collection subtype and preserve the original collection.
lib/compliance_engine/version.rb	Bumps gem/library version to 0.3.0.
metadata.json	Bumps module version to 0.3.0.
CHANGELOG.md	Adds 0.3.0 entry documenting Issue #37 change.

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