feat(grok): surface intake/secretary in the mix-mode picker; doc guardrail parity

- Panel: add intake-1 (prompter) and secretary-1 to the mix-mode per-agent
  routing list so an operator can assign Grok (or Claude) to the interactive
  roles from the UI; assigning a Grok model routes them to the opencode-serve
  image. tsc + eslint clean.
- opencode_config: correct the now-stale parity note — bash-guard is ported
  (secret-scrub.js) and usage/cost is captured (opencode store); the remaining
  gap is the budget/loop/stop/prompt-injection hooks, which need a sidecar
  plugin (open decision), with ROBOCO_GROK_BASH_PERMISSION as the interim gate.

panel/src/components/settings/ai-routing-card.tsx

@@ -74,6 +74,11 @@ const AGENTS: { slug: string; label: string }[] = [
   { slug: "ux-dev-1", label: "UX/UI Dev" },
   { slug: "ux-qa", label: "UX/UI QA" },
   { slug: "ux-doc", label: "UX/UI Documenter" },
+  // Interactive (held-open chat) roles. Claude (SDK driver) and Grok (opencode
+  // serve) are the supported runtimes; assigning a Grok model routes them to
+  // the grok-prompter / grok-secretary image.
+  { slug: "intake-1", label: "Intake (Prompter)" },
+  { slug: "secretary-1", label: "Secretary" },
 ];
 
 export function AIRoutingCard() {