- Drop skippy.w5isp.com:8080 as HRRR_BASE_URL in dev/prod config and
all K8s manifests. Default to direct NOAA S3 reads.
- Strip hrrr_cache_dir disk-caching infrastructure from HrrrClient
(read_cache, write_cache, download_and_cache_grib_ranges). Files are
now fetched fresh each time — no local filesystem cache.
- Update stale skippy references in network-policy, test comments, docs.