feat: AI quality improvements - caching, logging, fallback, and comprehensive tests

[onyinyechinwokwu-success]

Summary

This PR implements comprehensive improvements to the AI Song Quality Filter pipeline, addressing four related issues in the Stellar Wave Program.

Changes

Issue #422: Add caching of quality analysis results per track

• ✅ Implemented class with LRU eviction
• ✅ Added TTL-based expiration (default 24 hours)
• ✅ Support for metadata-based cache invalidation via hash
• ✅ Cache statistics tracking (hits, misses, hit rate)
• ✅ Integrated caching into analyzeSongQuality function
• ✅ Comprehensive unit tests for cache functionality

Issue #425: Add fallback behavior if NVIDIA API is unavailable

• ✅ Graceful degradation when NVIDIA API fails
• ✅ Configurable fallback assessments via options
• ✅ Handles network errors, timeouts, invalid responses
• ✅ Returns review verdict with informative reasons
• ✅ Comprehensive unit tests for all failure scenarios

Issue #427: Implement logging for AI analysis pipeline

• ✅ Detailed logging throughout the analysis pipeline
• ✅ Configurable via enableLogging option
• ✅ Injectable logger function (defaults to console.log)
• ✅ Logs cache hits/misses, API calls, errors
• ✅ Structured log messages with contextual data
• ✅ Unit tests verifying logging behavior

Issue #428: Write unit tests for quality scoring logic

• ✅ 28 comprehensive unit tests covering all features
• ✅ Tests for basic quality assessment
• ✅ Tests for caching functionality (Add caching of quality analysis results per track #422)
• ✅ Tests for logging functionality (Implement logging for AI analysis pipeline #427)
• ✅ Tests for fallback behavior (Add fallback behavior if NVIDIA API is unavailable #425)
• ✅ Tests for error handling
• ✅ Tests for API integration
• ✅ All tests passing with 100% coverage of core logic

Test Evidence

All 28 unit tests pass successfully:

✓ tests/lib/songQualityFilter.test.ts (28 tests)
  ✓ basic quality assessment (5 tests)
  ✓ caching functionality (#422) (4 tests)
  ✓ logging functionality (#427) (4 tests)
  ✓ fallback behavior (#425) (6 tests)
  ✓ error handling (5 tests)
  ✓ API integration (4 tests)

Documentation

• Added comprehensive inline documentation
• Updated function signatures with new options
• Included examples in code comments
• All changes follow existing code style

Closes

Closes #422
Closes #425
Closes #427
Closes #428

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Part of the AI Song Quality Filter (Mastra AI + NVIDIA) initiative for AudioBlock

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