feat+test:comments: add 7 comment generation functions and testsHEADmain

   Implement 5 new comment styles (simple-divider, padded-divider, heavy-box,
   unicode-box, block-banner) and refactor 2 existing functions (inline-border,
   comment-box) to use interactive/non-interactive pattern for testability.
   Add 178 tests across 7 test files with validation for length constraints and
   cross-language support. Fix linter warnings for parameter shadowing and
   docstring formatting.

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