[FEATURE]: Configurable Agent Cycling Order (Tab)

[axsuul]

Feature hasn't been suggested before.

• [x] I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

I use multiple primary agents in my workflow (e.g., ⁠Build, ⁠Plan, and a custom ⁠Development agent). Currently, when I use ⁠Tab to cycle between them, the order seems fixed (likely alphabetical or based on load order). For example, I often want to toggle quickly between ⁠Build and ⁠Plan. However, my custom ⁠Development agent sits between them in the cycle. Pressing ⁠Tab from ⁠Build sends me to ⁠Development instead of ⁠Plan. Instead I want it to be in the order of Build, Plan, Development.

I propose being able to configure the order with something like:

"agent": {
  "build": {
    "mode": "primary",
    "priority": 10
  },
  "plan": {
    "mode": "primary",
    "priority": 5
  },
  "development": {
    "mode": "primary",
    "priority": 1
  }
}