feat(export): add attachment exclude patterns

[AlexanderTheGrey]

Description

Adds --exclude-attachments <patterns> to confluence export, allowing comma-separated glob patterns to exclude matching attachments from single-page and recursive exports.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring

Testing

• Tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Additional Context

• Add --exclude-attachments <patterns> to confluence export
• Support comma-separated, case-insensitive glob patterns
• Exclude matching attachments from downloads
• Apply attachment exclusions to both single-page and recursive exports
• Add tests for attachment exclusion behavior
• Update documentation

Example

confluence export 123456789 --exclude-attachments "*.mp4,*.mov"

Testing

Added coverage for multiple patterns, case-insensitive matching, interaction with existing attachment filters, recursive exports, --skip-attachments, and excluding all matching attachments.

[pchuri]

Thanks for the contribution, @AlexanderTheGrey — this is a well-executed PR. 🎉

What I like:

• Extracting the duplicated attachment-filtering logic (single-page and recursive paths) into a shared filterAttachments helper is a nice cleanup on its own — the existing --pattern → --referenced-only → all precedence is preserved exactly, with exclusions applied last as documented.
• The comma-separated parsing (split(',') → trim → filter) mirrors the existing --exclude option for page titles, so the CLI stays consistent.
• Solid test coverage: multiple patterns, case-insensitive matching (recording.MOV vs *.mov), interaction with --pattern / --referenced-only / --skip-attachments, recursive export, empty-pattern handling, and the exclude-everything edge case.
• Docs updated in all three places (README examples, command table, and SKILL.md).

Verified locally:

• matchesPattern in lib/confluence-client.js genuinely supports pattern arrays and defaults to case-insensitive matching via globToRegExp, so the helper's array usage is safe (the tests mock the client, so I double-checked the real implementation).
• Full test suite (1128 tests) and ESLint pass on the branch; CI is green across Node 18/20/22.

LGTM — approving.

[github-actions]

🎉 This PR is included in version 2.22.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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