Add support for extracting paths from markdown comments and rename offset methods

[kunlinglio]

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[Copilot]

Pull request overview

This PR extends the tree-sitter-based path extraction pipeline to also find paths written using Markdown syntax inside comments (e.g., markdown links and inline code in //, /* */, doc comments, and HTML comments), and renames the document offset-to-position helper to explicitly reflect byte-based positioning.

Changes:

• Add per-language comment-range extraction helpers (markdown/mdx, html, dockerfile, and a general extractor for several languages).
• Update path extraction to re-parse comment ranges as Markdown and merge those candidates with existing string-literal candidates.
• Rename offset_to_utf8_pos → offset_to_byte_pos and adjust tests/docs/changelog accordingly.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/parser/tree_sitter/ts_markdown.rs	Adds detection of HTML comment node ranges in markdown/mdx trees.
src/parser/tree_sitter/ts_html.rs	Adds HTML comment range collection for subsequent markdown re-parse.
src/parser/tree_sitter/ts_general.rs	Adds comment range collection across multiple languages (incl. Rust-specific comment node kinds).
src/parser/tree_sitter/ts_dockerfile.rs	Adds Dockerfile comment range collection for markdown re-parse.
src/parser/tree_sitter/mod.rs	Integrates comment-range extraction + markdown re-parse into the main extraction flow; updates/extends tests.
src/document/mod.rs	Renames and simplifies offset→(row,col) conversion to byte terminology.
README.md	Updates roadmap/status entry to reflect the new comment-markdown extraction capability.
CHANGELOG.md	Records the new core capability in the changelog.

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