Generalize the auth-gated enterprise resolver to any remote and build a
cached hosted-identity family (origin/issue/candidates/source) on top of
it, then migrate every github.com-only consumer: Tasks listing/counting,
branch-to-PR discovery, push targets, fork upstream, issue operations,
Projects, web links, avatars, and PR-link facts. Scope the rate-limit
breaker probe per runtime:host and classify WSL UNC cwds correctly.
Co-authored-by: Orca <help@stably.ai>
