[claude skill workflow testing] Add optional comment parameter to concat::fragment

[mehul-jain1]

Summary

• Adds an optional comment parameter to concat::fragment that prepends # -prefixed comment lines above the fragment content
• Supports multiline comments (each line gets the # prefix)
• Validates that comment cannot be used with source (only with content)
• Includes 4 new unit tests covering: basic usage, multiline, source rejection, and type validation

Test plan

• bundle exec rake syntax lint metadata_lint check:symlinks check:git_ignore check:dot_underscore check:test_file rubocop — all pass
• bundle exec rake parallel_spec — 258 examples, 0 failures
• CI pipeline passes
• Acceptance tests on provisioned target (if applicable)

🤖 Generated with Claude Code

[skyamgarp]

Closing as it's Testing PR