MNI-6: MakerNote Integration Tests & Benchmarks

[rpuneet]

Summary

Create comprehensive integration tests and benchmarks for MakerNote parsers.

Test Data Required

• Canon: CR2, JPG from various models (5D, R5, etc.)
• Sony: ARW, JPG from various models (A7, A9, etc.)
• Nikon: NEF, JPG from various models (D850, Z6, etc.)
• Fujifilm: RAF, JPG from various models (X-T4, GFX, etc.)

Integration Tests

• Mixed manufacturer batch processing
• Graceful handling of unknown manufacturers
• Partial parse on corrupted MakerNote
• Nested HEIC/AVIF → EXIF → MakerNote flow

Benchmarks

• Per-manufacturer parse time
• Memory allocation tracking
• Comparison with raw-byte extraction baseline
• Target: < 5% overhead vs not parsing MakerNote

Fuzz Testing

• Malformed headers
• Invalid IFD counts
• Out-of-bounds offsets
• Mixed endianness edge cases

Acceptance Criteria

• 90%+ code coverage for makernote package
• No performance regression (benchmark proof)
• Fuzz tests pass 10k iterations

Blocked by: MNI-2, MNI-3
Parent: #9