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>

package.json

@@ -147,7 +147,9 @@
     "@rollup/plugin-replace": "^6.0.2",
     "@rollup/plugin-terser": "^0.4.4",
     "@testcontainers/redis": "^11.5.1",
+    "@types/mime": "^3.0.4",
     "@types/node": "^20.11.30",
+    "@types/sharp": "^0.31.1",
     "@types/uuid": "^10.0.0",
     "@types/ws": "^8.18.1",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
@@ -175,13 +177,16 @@
     "cli-table3": "^0.6.5",
     "commander": "^11.1.0",
     "csv-parse": "^6.1.0",
+    "exifr": "^7.1.3",
     "inquirer": "^12.9.3",
     "js-yaml": "^4.1.0",
     "mammoth": "^1.11.0",
+    "mime": "^4.1.0",
     "ora": "^8.2.0",
     "pdfjs-dist": "^4.0.379",
     "prompts": "^2.4.2",
     "roaring-wasm": "^1.1.0",
+    "sharp": "^0.33.5",
     "uuid": "^9.0.1",
     "ws": "^8.18.3",
     "xlsx": "^0.18.5"