`PresetCatalog._validate_catalog_url` called `urlparse(url).hostname` without
guarding it. For a malformed authority such as an unterminated IPv6 bracket
(`https://[::1`), `urlparse(...).hostname` raises `ValueError: Invalid IPv6 URL`,
which escapes the method. Its docstring promises `PresetValidationError`, and its
callers (`preset catalog add`, `preset catalog list` reading the
`SPECKIT_PRESET_CATALOG_URL` env var / `.specify/preset-catalogs.yml`) only catch
`PresetValidationError` -- so a malformed URL crashes the CLI with a traceback
instead of a clean error message.
The shared `CatalogStackBase` (#3435), `workflows` (#3484), `bundler` (#3433) and
`IntegrationCatalog` copies already wrap this in `try/except ValueError`; the
preset validator was the remaining un-updated twin. Mirror the shared
implementation: wrap `urlparse` + `.hostname`, re-raise as
`PresetValidationError("Catalog URL is malformed: ...")`, and read the local
`hostname` in the host check.
Add a regression test mirroring `IntegrationCatalog`'s
`test_malformed_url_rejected_cleanly`; it is red before the fix (raw `ValueError`)
and green after.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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