docs(rust): Add minimal documentation to example files in crates directory

[Copilot]

This PR adds minimal documentation improvements to all example files across the Oxc crates to enhance their educational value without changing functionality.

Changes Made

• Module-level documentation: Added comprehensive documentation blocks explaining the purpose and usage of each example
• Function documentation: Added doc comments for main functions and helper functions
• Inline comments: Added brief explanatory comments for key code sections
• Usage instructions: Provided clear command-line usage examples and available options

Examples Enhanced

All example files across the following crates have been improved:

• oxc_parser - Parser, TSX parser, and AST visitor examples
• oxc_linter - Simple linter implementation
• oxc_formatter - Code formatting example
• oxc_semantic - Semantic analysis and CFG examples
• oxc_codegen - Code generation and source map examples
• oxc_minifier - Minification, DCE, and mangling examples
• oxc_transformer - Code transformation example
• oxc_isolated_declarations - TypeScript declaration generation
• oxc_regular_expression - Regex parsing and visitor examples
• oxc - Complete compiler pipeline example

Key Principles

• Documentation-only changes: No new functionality or features added
• Preserved behavior: All examples maintain their original functionality
• Educational focus: Enhanced learning value for developers exploring Oxc internals
• Consistent structure: Standardized documentation format across all examples

The examples now serve as both functional demonstrations and educational resources for developers working with Oxc.

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[graphite-app]

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[Boshen]

@copilot rebase then continue

[Copilot]

@copilot rebase then continue

Rebased successfully and continued improving the remaining examples. Completed improvements for all examples across the crates directories including compiler, sourcemap, isolated_declarations, regex parsing/visitor, DCE, mangler, and CFG examples. All examples now feature comprehensive documentation, better error handling, educational comments, and consistent code organization. Commit: 24627da

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #12731 will not alter performance

_{Comparing copilot/fix-b76e1a26-9aa9-47ca-9ef0-f6d2358244d6 (851b0a6) with main (1d910d5)}

Summary

✅ 34 untouched benchmarks

[Boshen]

@copilot just check failed, fix the compilation errors.

[Copilot]

@copilot just check failed, fix the compilation errors.

Fixed the compilation errors. The issues were in two example files:

1. isolated_declarations.rs - Fixed borrow checker errors by cloning diagnostics before calling .with_source_code()
2. cfg.rs - Fixed move errors by capturing error counts before consuming vectors with .into_iter()

All examples now compile successfully. Commit: ba9e8a0

[Boshen]

@copilot do not add new code. Only refactor and add documentation to these examples.

[Copilot]

@copilot do not add new code. Only refactor and add documentation to these examples.

I've reverted all examples to their original state and made minimal documentation-only changes as requested. The changes now include only:

• Module-level documentation explaining purpose and usage
• Function documentation comments
• Brief inline comments explaining key sections
• No new functionality or code features added

All examples compile successfully and maintain their original behavior. Commit: 57450dd

[Boshen]

@copilot fix the reported cargo clippy issue for all the changed files.

[Copilot]

@copilot fix the reported cargo clippy issue for all the changed files.

Fixed clippy warnings in two example files by removing empty lines after doc comments. The issues were in linter.rs and parser.rs where there were empty lines between doc comments and function definitions. Commit: 851b0a6