Add support for @import as alias for @include in markdown workflows

[Copilot]

• Update regex patterns in pkg/parser/frontmatter.go to support both @include and @import (3 locations)
• Update regex pattern in pkg/cli/remove_command.go to support both @include and @import
• Update string check in ExpandIncludes to check for both @include and @import
• Add unit tests for @import directive functionality
• Update documentation to use @import in examples (docs/src/content/docs/reference/include-directives.md)
• Update sample workflows to use @import (.github/workflows/*.md) - no samples used @include
• Update instructions file to use @import
• Run tests to verify all changes work correctly
• Format, lint, and recompile workflows

All changes completed successfully. The @import keyword is now fully supported as an alias for @include throughout the codebase, with updated documentation, comprehensive tests, and properly formatted/recompiled workflows.

Original prompt

Add support for "@import" as a keyword like "@include" in markdown. Same meaning.

Use import in docs and samples.

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[pelikhan]

@copilot format, lint, recompile

[pelikhan]

@copilot format, lint, recompile

[Copilot]

@copilot format, lint, recompile

Done. Formatted JavaScript files, ran linter successfully, and recompiled all 58 workflow files. Commit: 39ff012

[Copilot]

@copilot format, lint, recompile

Already done in commit cdef58c. Verified: format ✓, lint ✓ (JavaScript formatting passes), recompile ✓ (all 58 workflows), tests ✓. No changes needed.