Completes the internal/api scoping pass -- the whole package now compiles
against the per-user store/sync/garmin signatures from Tasks 4-13. Also
fixes the test helpers (newTestServer now returns the provisioned userID)
and a latent bug in TestResolveUser_LeavesContextEmptyWhenNotProvisioned,
which relied on doJSON's hardcoded "test-user" session sub being
unprovisioned -- never caught before since internal/api couldn't compile
since Task 12.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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.
