Fix doclinks use git

[spomichter]

No description provided.

[greptile-apps]

Greptile Summary

Refactors doclinks.py to use git ls-files instead of manually parsing .gitignore and walking the directory tree with os.walk. This simplifies the codebase by ~60 lines while achieving the same goal of indexing only git-tracked files. The change is cleaner and more reliable since it delegates gitignore handling to git itself.

• Replaced load_gitignore_patterns() and should_ignore() functions with get_git_tracked_files() which calls git ls-files --cached --others --exclude-standard
• Simplified build_file_index() and build_doc_index() to iterate over the tracked files list instead of using os.walk with manual filtering
• Removed Pikchr diagram source from reactivex.md, keeping only the pre-generated SVG (follows previous commit that removed Pikchr tooling)

Confidence Score: 5/5

• This PR is safe to merge - it simplifies existing functionality using a more reliable approach with no behavioral changes
• The changes replace manual gitignore parsing with git's built-in file tracking. The git ls-files command correctly includes both cached (committed) and untracked-but-not-ignored files, matching the original behavior. Error handling is preserved. Existing tests cover the public API (build_file_index, build_doc_index) and should validate the refactor.
• No files require special attention

Important Files Changed

Filename	Overview
dimos/utils/docs/doclinks.py	Refactored file indexing to use git ls-files instead of manual gitignore parsing and os.walk, simplifying code by ~60 lines while maintaining identical functionality.
docs/api/sensor_streams/reactivex.md	Removed Pikchr diagram source code block, keeping only the pre-generated SVG image reference.

Sequence Diagram

sequenceDiagram
    participant Client as doclinks CLI
    participant Git as Git subprocess
    participant FS as File System
    
    Client->>Git: git ls-files --cached --others --exclude-standard
    Git-->>Client: List of tracked file paths
    Client->>Client: Build file index from paths
    Client->>Client: Build doc index (filter .md files)
    Client->>FS: Read markdown files
    Client->>Client: Process links using indices
    Client->>FS: Write updated markdown files

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[leshy]

just this deletion sneaked in, otherwise looking good

[spomichter]

#943 overrides