- refresh and logout read the Bearer header first, then the summer_admin
cookie; a cookie refresh rotates the cookie without a token in the body and
logout always expires the cookie
- backend.cookie_secure (default true) may drop Secure outside production only
- activation rejects controller vendor segments api, assets, login, settings
- BuildRouter rejects non-cabana routes at or under the admin prefix
- SPA single-flights refresh on 401, replays once, and refreshes proactively
at 80 percent of expires_in; dist rebuilt
- scripts/check-admin-dist.sh rebuilds the SPA and fails on dist drift
- tests: TestPhase10CookieAuth, TestPhase10CSRF, TestPhase10Prefix,
TestPhase10AdminPrefixCollision, boardwalk serving and header tests
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