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`CatalogStackBase._validate_catalog_url` (inherited by `IntegrationCatalog`) and `PresetCatalog._validate_catalog_url` checked `parsed.netloc`, which is truthy for host-less URLs like `https://:8080` (port only) or `https://user@` (userinfo only). Such URLs slipped past validation despite the error message promising "a valid URL with a host", then failed later with a confusing fetch error. Switch both validators to `parsed.hostname` (None for those inputs), matching the workflow, step, and bundler catalog validators that already do this. Add regression tests covering port-only and userinfo-only URLs for both validators. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>