feat: add ImageHandler with EXIF extraction and comprehensive MIME detection (v5.2.0)

Implements Phase 1.5 (Comprehensive MIME Type Detection) and adds built-in image processing support to IntelligentImportAugmentation.

**New Features:**
- ImageHandler: Extracts image metadata (dimensions, format, color space) using sharp
- EXIF extraction: Camera data, GPS, timestamps using exifr library
- Support for JPEG, PNG, WebP, GIF, TIFF, BMP, SVG, HEIC, AVIF formats
- MimeTypeDetector: Unified MIME type detection with magic byte support
- FormatDetector: Enhanced with image format detection via MIME + magic bytes

**Architecture Fixes:**
- Fixed brain.import() augmentation pipeline integration (src/brainy.ts:3140-3154)
- Added parameter spreading for ImportSource objects to enable augmentation access
- Fixed metadata propagation through ImportCoordinator to final results
- Added augmentation data check in ImportCoordinator.extract()

**Integration:**
- ImageHandler registered as built-in handler alongside CSV, Excel, PDF
- Images import as 'media' entities with 'image' subtype
- Full metadata preserved in knowledge graph entities
- Configuration options: enableImage, extractEXIF, imageDefaults

**Test Coverage:**
- 15 integration tests (image-import.test.ts) - 100% passing
- 27 unit tests (image-handler.test.ts) - 100% passing
- Format detection tests for all supported image types
- Error handling and resilience tests

**Breaking Changes:** None - backward compatible

Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

src/augmentations/intelligentImport/index.ts

@@ -8,8 +8,26 @@ export type {
   FormatHandler,
   FormatHandlerOptions,
   ProcessedData,
-  IntelligentImportConfig
+  IntelligentImportConfig,
+  HandlerRegistry
 } from './types.js'
+
+// Format Handlers
 export { CSVHandler } from './handlers/csvHandler.js'
 export { ExcelHandler } from './handlers/excelHandler.js'
 export { PDFHandler } from './handlers/pdfHandler.js'
+export { ImageHandler } from './handlers/imageHandler.js'
+
+// Format Handler Registry (v5.2.0)
+export {
+  FormatHandlerRegistry,
+  globalHandlerRegistry
+} from './FormatHandlerRegistry.js'
+export type { HandlerRegistration } from './FormatHandlerRegistry.js'
+
+// Image Handler Types (v5.2.0)
+export type {
+  ImageMetadata,
+  EXIFData,
+  ImageHandlerOptions
+} from './handlers/imageHandler.js'