handleSetupComplete reused the onboarding client object as-is in the
permanent per-user cache, but its garmin.Config.TokenStorePath was fixed
at construction to the ephemeral setup/{hash} directory and never
corrected after that directory was renamed to the permanent {userID}
path. The next respawn of that same client (e.g. any Profile-page save,
which unconditionally calls UpdateCredentials) wrote a fresh token file
back under setup/{hash}, forcing a real re-login/MFA on the next Garmin
connect even though a valid session already existed under {userID}.
Close the ephemeral client instead and let the next garminFor call build
a fresh one against the correct, already-renamed directory.
resolveUser attaches the session's provisioned geniusrun user (if any) to
request context without blocking; requireProvisionedUser (wired fully in
Task 13) 403s routes that need one. GET /api/session/me now reports
has_profile/display_name so the frontend can show the setup screen.
