feat: add source file detection for React components

[fab-uleuh]

Summary

• Add sourceAttribute prop to configure which data attribute to read source location from
• Add sourceFile, sourceComponent, sourceUnavailableReason fields to Annotation type
• Detect source via data-tsd-source attribute (TanStack Devtools compatible)
• Fallback to React fiber _debugSource in dev mode

Configurable source attribute

The sourceAttribute prop allows customizing which HTML data attribute is used to read source file paths:

// Default: reads from data-tsd-source (TanStack Devtools)                                                                                                                               
<Agentation />                                                                                                                                                                           
                                                                                                                                                                                         
// Custom: reads from your own data attribute                                                                                                                                            
<Agentation sourceAttribute="data-my-source" />                                                                                                                                          
                                                                                                                                                                                         
This makes the feature compatible with any tooling that injects source location as data attributes, not just TanStack Devtools.                                                          
                                                                                                                                                                                         
Changes                                                                                                                                                                                  
                                                                                                                                                                                         
- types.ts - New optional source fields on Annotation                                                                                                                                    
- source-location.ts - Detection utilities with React 16-19 support                                                                                                                      
- index.tsx - New sourceAttribute prop (default: "data-tsd-source")                                                                                                                      
- README.md - Document new prop and fields                                                                                                                                               
- CLAUDE.md - API changelog for 1.4.0                                                                                                                                                    
                                                                                                                                                                                         
Use case                                                                                                                                                                                 
                                                                                                                                                                                         
When annotating elements in dev mode, annotations now include the source file path (e.g., src/components/Button.tsx:42), helping AI agents locate the exact code being referenced.       

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