fix(bundler): guard lazy .hostname ValueError in catalog add_source (#3644)

A bracketed-but-invalid IPv6 authority (e.g. "https://[not-an-ip]/c.json")
parses cleanly under urlparse() on Python < 3.14 and only raises ValueError
lazily on the first .hostname access. add_source read parsed.hostname
outside the try/except ValueError guard, so on the interpreters spec-kit
supports (>=3.11) that raw ValueError leaked past the CLI's
`except BundlerError`, surfacing an uncaught traceback instead of the clean
"Invalid catalog url" domain error. (The raise moved eager into urlparse()
only in 3.14.)

Read parsed.hostname inside the try and reuse the value for both the
HTTPS/localhost check and the require-host check. This also protects the
later _derive_id() call on the same URL.

Regression tests: a bracketed-non-IP URL, plus a monkeypatched
lazy-.hostname raiser that reproduces the pre-3.14 shape independently of
the running interpreter (fails with a raw ValueError before the fix).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/specify_cli/bundler/commands_impl/catalog_config.py

@@ -143,6 +143,13 @@ def add_source(
         raise BundlerError("A catalog url is required.")
     try:
         parsed = urlparse(url)
+        # Read .hostname inside the try: a bracketed-but-invalid IPv6 authority
+        # (e.g. "https://[not-an-ip]/c.json") parses cleanly under urlparse() on
+        # Python < 3.14 but raises ValueError lazily on the first .hostname access
+        # (the raise moved eager into urlparse() only in 3.14). Reading it here
+        # keeps that ValueError inside the guard instead of leaking a raw
+        # traceback past the CLI's `except BundlerError`. Reuse the value below.
+        hostname = parsed.hostname
     except ValueError as exc:
         raise BundlerError(f"Invalid catalog url: '{url}'.") from exc
     if not (parsed.scheme or parsed.path):
@@ -161,13 +168,13 @@ def add_source(
         # netloc — netloc is truthy for host-less URLs like "https://:8080"
         # or "https://user@". Validating here keeps junk out of
         # bundle-catalogs.yml instead of failing later at fetch time.
-        is_localhost = parsed.hostname in ("localhost", "127.0.0.1", "::1")
+        is_localhost = hostname in ("localhost", "127.0.0.1", "::1")
         if parsed.scheme.lower() != "https" and not is_localhost:
             raise BundlerError(
                 f"Catalog url must use HTTPS (got {parsed.scheme}://). "
                 "HTTP is only allowed for localhost."
             )
-        if not parsed.hostname:
+        if not hostname:
             raise BundlerError(f"Catalog url must be a valid URL with a host: {url}")
 
     url = _canonicalize_url(url)