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* fix(extensions): re-validate catalog URL after redirects (HTTPS parity) ExtensionCatalog._fetch_single_catalog opened the catalog URL and trusted the payload without re-validating response.geturl() after redirects. _open_url follows redirects (stripping auth only on an HTTPS->HTTP downgrade), so an https:// catalog entry that 30x-redirects to http://attacker/... was still fetched and trusted. The payload supplies each extension's download_url + sha256, so a redirected payload can drive install of an arbitrary archive that passes sha256 verification. Add the post-redirect geturl() re-validation via _validate_catalog_url, mirroring integrations/catalog.py, presets, workflows/catalog.py, and bundler adapters. Sibling of the same fix in the presets catalog fetcher. Test: an HTTPS URL whose response.geturl() reports http:// is rejected (ExtensionError). Completed existing fetch-test mocks that predated this behavior to report geturl() like a real urllib response. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(extensions): correct auth-strip comment; validate every redirect hop + guard legacy fetch_catalog - Correct the comment: _StripAuthOnRedirect strips auth not only on an HTTPS->HTTP downgrade but also whenever the redirect leaves the configured trusted hosts. The comment now describes both cases. - Parity with the presets fix: validate EVERY redirect hop (not just the terminal URL) so an https -> http -> attacker-https chain can't slip a redirected payload past the final-URL check. _open_url forwards a redirect_validator to open_url; _fetch_single_catalog passes _validate_catalog_url through it while keeping the final geturl() check. - Give the legacy public fetch_catalog() single-catalog path the same redirect_validator + final geturl() validation (it previously parsed the body with no redirect check). Tests: an intermediate http hop is rejected, and the legacy fetch_catalog() rejects an HTTPS->http redirected payload (both fail before). Full test_extensions.py (356) green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * test(extensions): cover legacy fetch_catalog() per-hop redirect validation The legacy fetch_catalog() regression test only exercised the terminal geturl() check, so it would still pass if the per-hop redirect_validator were dropped from that duplicated path. Add test_fetch_catalog_legacy_validates_every_redirect_hop, which asserts fetch_catalog() supplies a redirect_validator that rejects an insecure intermediate hop (fails before: the legacy path passed no validator -> NoneType not callable). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>