Malachite v0.9.0 — Performance & Rate Limiting Overhaul

Adaptive Pacing I've completely redesigned the rate limiting and batching logic in Malachite to maximize throughput while respecting PDS quotas. - Dynamic Batching: The tool now uses server-learned rate limits to dynamically adjust batch sizes and pacing in real-time. - Recovery Mode: Added a "recovery mode" with adaptive wait times for when quotas are critically low. - Credential Security: Implemented SHA-512 based auto-saving for credentials and standardized all local storage paths to ~/.malachite/. - Validation: Added unit tests for Spotify imports, CSV parsing, and sync utilities to ensure reliability during high-speed operations.