Oracle: Shell canvas / every Gaps stage (mock shell.jsx ModuleHeader); Guideline §7
Glass bar, 56px. Breadcrumb starts with the module's icon chip: i-mark › [chip] Module. ⌘K pill right of center; bell immediately left of the avatar.
Trail truncates middle entries; current page in foreground. Badge = blue primary-solid pill with a 2px canvas ring — never red.
The avatar is locked chrome (§7); its menu contents were never designed on a canvas. Minimal proposal below (identity · theme toggle · sign out) — flagged in the README for veto.