(plan) convert original implement plan to mock api

tasks/4.8-frontend-terminal-wiring.md

@@ -1,8 +1,9 @@
-# 4.8 — Frontend: wire InteractiveTerminal to /api/exec (GREEN)
+# 4.8 — Frontend: wire terminal page to /api/exec (GREEN)
 
 Phase: 4 — Terminal (Surface C)
 Stage: GREEN
 
 Depends on: [4.4](4.4-api-exec.md)
 
-- [ ] Frontend: reuse [components/InteractiveTerminal.tsx](../components/InteractiveTerminal.tsx), wire to `/api/exec`
+- [ ] [app/cluster/terminal/page.tsx](../app/cluster/terminal/page.tsx) currently has its own inline `run()` command parser — replace it with a `fetch('/api/exec', { method: 'POST', body: JSON.stringify({ cmd }) })` call so the terminal actually round-trips through the mock API instead of simulating client-side
+- [ ] [components/InteractiveTerminal.tsx](../components/InteractiveTerminal.tsx) (the floating Cmd+K terminal) is a separate, older component with its own hardcoded `commands` map (`kubectl`, `terraform`, `argocd`, `kafka` — all backend/infra flavored) — decide whether to retire it, or reduce it to the same closed command set as the Surface C terminal and wire it to `/api/exec` too