V8 Maglev JIT causes STATUS_STACK_BUFFER_OVERRUN (0xC0000409) on Windows 11 Insider build 26200

## What happened? Node.js processes crash with exit code `-1073740791` (`0xC0000409` / `STATUS_STACK_BUFFER_OVERRUN`) within 20-70 seconds of startup when running a non-trivial application (WebSocket server with HTTP, Telegram bot polling, and plugin system) on Windows 11 Insider (Canary channel). The crash is caused by V8's **Maglev** JIT compiler tier. Workaround: `--no-maglev` flag eliminates the crash entirely. ## Reproduction **Environment:** - Node.js: v25.8.0 - V8: 14.1.146.11-node.20 - OS: Windows 11 Pro for Workstations, Insider Canary build **10.0.26200.0** - Arch: x64 **Steps:** 1. Run a long-lived Node.js application that uses `fetch()`, WebSocket, and timers on Windows 11 Insider build 26200 2. Process crashes with exit code `-1073740791` (0xC0000409) within 20-70 seconds 3. No JavaScript stack trace — the crash is in native JIT-compiled code via `__fastfail` **Flags tested:** | Flag | Crash? | `fetch()` works? | |------|--------|------------------| | (none) | **Yes** — crashes in 20-70s | Yes | | `--jitless` | No | **No** — undici fetch broken | | **`--no-maglev`** | **No** | **Yes** | | `--no-turbofan` | No | Yes | `--no-maglev` is the minimal workaround — disabling only the Maglev tier prevents the crash while keeping TurboFan and fetch() functional. **Additional context:** - A bare Node.js HTTP server (`http.createServer`) does NOT crash — the issue requires enough code to trigger Maglev optimization - Crash bypasses Windows Error Reporting (`__fastfail` / SEH) - Windows Event Viewer shows the Insider build has kernel-level instability (BlueScreen events, VIDEO_ENGINE_TIMEOUT_DETECTED), suggesting stricter CFG enforcement - The same application runs without issues on Windows Server 2019 and stable Windows builds ## Expected behavior Node.js should not crash with STATUS_STACK_BUFFER_OVERRUN. Maglev-compiled code should respect Windows CFG/CET enforcement on Insider builds. ## Workaround Pass `--no-maglev` as a command-line flag (cannot be set via `NO…