Fixes #35 test failures by addressing version detection and extractor logic issues.

**Issues Fixed:**
1. QTI 3.0 version detection not recognizing fragment elements
2. Broken canHandle methods after refactoring
3. Missing QTI 3.0 element name checks in extractors
4. Registry API not converting element types to canonical form

**Changes:**

Version Detection (detectQtiVersion.ts):
- Enhanced to recognize any qti- prefixed element as QTI 3.0
- Added regex pattern for kebab-case QTI 3.0 elements in string detection

Extractor canHandle Methods:
- Reverted 14 extractors to check element.rawTagName (proper validation)
- Added QTI 3.0 kebab-case element name checks for 3 extractors:
  - textEntryExtractor: checks both 'textEntryInteraction' and 'qti-text-entry-interaction'
  - extendedTextExtractor: checks both camelCase and kebab-case
  - matchExtractor: checks both camelCase and kebab-case

Registry API (ExtractionRegistry.ts):
- Fixed getExtractorsForType() to convert input to canonical form

Tests (qti3-attribute-extraction.test.ts):
- Fixed querySelector calls to use lowercase for HTML parser compatibility

**Test Results:**
✅ All 1568 tests passing (previously 10 failures)

Co-Authored-By: Claude <[email protected]>