Edison Jwa
8c6538aa41
feat(core): add blob cache wiring and avatar download orchestration
- Add chanora_cache dependency to Cargo.toml
- Add blob_cache field to ChanoraSession (Arc<Mutex<Option<BlobCache>>>)
- Add init_cache() method: creates BlobCache, runs eviction
- Add get_avatar() method: cache-first, download on miss, store in cache
- Add clear_cache() and cache_size() methods for cache management
- Add CoreError::Cache variant for BlobCacheError conversion
- Add avatar_cache integration test