OFFICE-022: Update CLI Documentation

[murdore]

Summary

Update CLI documentation to include office document flags: --docx, --pptx, --xlsx usage examples, command reference, error messages. Update docs/cli/commands.md and create docs/cli/office-files.md.

Technical Details

• File(s): docs/cli/commands.md, docs/cli/office-files.md (new)
• Effort: 1 hour

Acceptance Criteria

• [ ] docs/cli/office-files.md created
• [ ] --docx flag documented with examples
• [ ] --pptx flag documented with examples
• [ ] --xlsx flag documented with examples
• [ ] Mixed file usage documented
• [ ] Error messages documented
• [ ] CLI command reference updated
• [ ] Help text examples included

Dependencies

• Depends on: OFFICE-013
• Blocks: OFFICE-024

Priority: high Effort: 1h Complexity: simple