feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

web/components/workbench-header.tsx

@@ -1,3 +1,4 @@
+// Modified in this independent fork for support availability; see docs/hardening/README.md.
 "use client"
 
 import { BellIcon, KeyRoundIcon, LogOutIcon, UserIcon } from "lucide-react"
@@ -5,6 +6,7 @@ import { useRouter } from "next/navigation"
 import { useState } from "react"
 
 import { ChangePasswordDialog } from "@/components/change-password-dialog"
+import { OperatorStatusControl } from "@/components/support-availability/operator-status"
 import { OperatorReadinessIndicator } from "@/components/operator-readiness-indicator"
 import { PaletteToggle } from "@/components/palette-toggle"
 import { RealtimeConnectionStatus } from "@/components/realtime-connection-status"
@@ -33,7 +35,8 @@ export function WorkbenchHeader() {
     <header className="flex h-(--header-height) shrink-0 items-center border-b border-border/70 bg-background/88 backdrop-blur supports-[backdrop-filter]:bg-background/76">
       <div className="flex w-full min-w-0 items-center justify-end gap-3 px-3 lg:px-4">
         <div className="flex min-w-0 items-center justify-end gap-2">
-          <OperatorReadinessIndicator />
+          <OperatorStatusControl compact />
+          <OperatorReadinessIndicator compact />
           <div className="hidden sm:block">
             <RealtimeConnectionStatus status={realtimeStatus} compact />
           </div>