fix: GitHub fetch caching#52
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Summary
Hardens
fetchLanguageData's caching behavior and fixes a bug inIGNORED_REPOScachedLanguageDataand served as truth for a full hour. Both now share one guard; a result is only cached when no source failed.fetchLanguageDataon a cold/expired cache each independently triggered a full repo-list + per-repo-languages crawl., now share a single in-flight promise.IGNORED_REPOS: previously matched by bare repo name only, so two sources (e.g. a user and an org) with a same-named repo couldn't be ignored independently. Now also acceptsowner/nameto scope an ignore to one source/languagescall was silently treated as "no languages" instead of a failure, unlike the repo-list fetch.