feat(ast): add PHP tree-sitter support

[yangxinxin-7]

Summary

Add PHP AST skeleton extraction using tree-sitter, enabling .php files to be parsed into structured code skeletons (imports, classes/methods, functions, docstrings) for downstream indexing and summarization.

What’s included

• PHP extractor (PhpExtractor) powered by tree-sitter-php
  • Parses use imports (including group use)
  • Extracts classes and methods, top-level functions
  • Collects docstrings with PHPDoc preference and adjacency checks
  • Captures class-internal trait use into class bases
  • Converts assigned closures/arrow functions ($x = function(...) {} / $x = fn(...) => ...) into pseudo top-level functions
  • Includes interface/trait/enum declarations in the skeleton output
• AST dispatch updated to route .php → php
• Adds dependency: tree-sitter-php
• Adds unit tests covering the PHP extractor behaviors

Files changed

• openviking/parse/parsers/code/ast/extractor.py
• openviking/parse/parsers/code/ast/languages/php.py
• pyproject.toml
• tests/parse/test_ast_extractor.py

How to test

python3 -m pip install -e ".[test]"
python3 -m pytest tests/parse/test_ast_extractor.py -v

[github-actions]

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