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/site-header.tsx

@@ -1,8 +1,10 @@
+// Modified in this independent fork for support availability; see docs/hardening/README.md.
 "use client"
 
 import { useEffect, useRef } from "react"
 import { usePathname } from "next/navigation"
 
+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"
@@ -78,6 +80,7 @@ export function SiteHeader() {
           </div>
         </div>
         <div className="flex shrink-0 items-center justify-end gap-2">
+          <OperatorStatusControl compact />
           <OperatorReadinessIndicator compact />
           <PaletteToggle />
           <ThemeToggle />