~anthropic/claude-sonnet-latest → A (8:2)

Side A is a real, tested refactor that de-duplicates substantial shared test logic (HTTP helpers, mock OAuth, server env, harness counters) across auth.bb, grants.bb, integration.bb, and oauth.bb, reducing duplication and improving maintainability with no behavior change. Side B is almost entirely a speculative planning document (plan.md) plus a thin, unused-by-callers RouteContext wrapper stub that doesn't migrate any call sites, representing scaffolding/intent rather than delivered value.