Bypass manual routing for Buzz sign-in, derive and validate identity in the controller, and initialize only public owner routing using the current Host relay after the stale/cancel fence. Retained owners still must match; custody remains session-only.
Regression drives the real Node/Bun UI once with no controller owner configured and an explicit synthetic credential fixture. Focused 12-test checks, typecheck, and first-use PTY walkthrough pass. Earlier broad-suite 400-second failure remains unresolved; no production Keychain access or native rebuild.
Signed-off-by: Logan Johnson <loganj@squareup.com>
