Operator home at `/fleet` (or authenticated landing): rollup gate inbox counts, convoys by status, and active `agent_runs` across all workspaces the user belongs to.
## Description
Core Epic 9 scope. Answers: **"What needs me across all projects?"**
### UI
- Card per connected repo / convoy workspace
- Badge: N awaiting approval (sum of `GATE_INBOX_STATUSES`)
- Quick links into `/{workspaceSlug}/mission-control?convoy=...`