CLI segfaults (SIGSEGV) on startup on Linux hosts with ASLR disabled (kernel.randomize_va_space=0)

## Description

On corporate Linux workstations (SLES 15 SP4, kernel 5.14.21, glibc 2.31, x86_64) where ASLR is disabled system-wide via `kernel.randomize_va_space = 0` (a common hardened-security baseline in some enterprise environments), the `copilot` binary crashes immediately with `SIGSEGV` on every invocation, including `copilot --version` and `copilot --help`. No output is produced at all before the crash.

The Node wrapper that launches the native binary reports:
```
GitHub Copilot native binary at .../node_modules/@github/copilot-linux-x64/copilot was terminated by signal SIGSEGV.
GitHub Copilot CLI: no platform package found. Reinstall with `npm install -g @github/copilot` to fetch the package for your platform.
```
This message is misleading — it suggests a missing/corrupt platform package, but the real cause is unrelated to installation integrity.

## Steps to Reproduce
1. On a Linux x86_64 host, disable ASLR: `sudo sysctl -w kernel.randomize_va_space=0`
2. Install/run `copilot --version` (or `--help`)
3. Observe immediate segfault (exit code 139), no output

## Diagnosis performed
- Confirmed with a completely fresh, checksum-validated download (rules out corrupted install)
- Reproduced on multiple different physical hosts sharing the same OS/security baseline (rules out single-machine hardware fault)
- Reproduced on both the current release (v1.0.71/v1.0.72) and a release from ~2.5 months earlier (v1.0.40) (rules out a recent regression)
- `ldd` on the binary shows all shared libraries resolve correctly (rules out missing-library issue)
- `strace` shows the process issuing a self-directed `tgkill(pid, pid, SIGSEGV)` very early during startup, consistent with a V8 sandbox/memory-reservation initialization failure that depends on ASLR being active
- `NODE_OPTIONS="--jitless"` and other V8 flags do not prevent the crash (crash happens before/independent of JIT)
- Re-enabling ASLR requires root (`sysctl -w kernel.randomize_va_space=2`); this is not something an unprivileged CLI user can work around

## Expected Behavior
Ideally the CLI would either:
1. Run correctly with ASLR disabled (e.g., build V8 without the sandbox feature, or handle the reservation failure gracefully), or
2. At minimum, detect this condition and print an accurate, actionable error message (e.g., "ASLR is disabled on this system; GitHub Copilot CLI's V8 runtime requires ASLR to be enabled") instead of the generic "no platform package found" message, which sends users down the wrong troubleshooting path (reinstalling, which does not help).

## Environment
- OS: SUSE Linux Enterprise Server 15 SP4
- Kernel: 5.14.21-150400.24.158-default
- glibc: 2.31
- Arch: x86_64 (Xeon W-3245, AVX-512 capable)
- CLI versions tested: v1.0.40, v1.0.71, v1.0.72
- `kernel.randomize_va_space`: 0 (disabled by corporate security policy)

## Additional context
This affects an entire fleet of shared corporate Linux workstations that use a common hardened security baseline with ASLR disabled, blocking all Copilot CLI usage on those machines. We're separately requesting our IT team re-enable ASLR, but filing this so the CLI can (a) fail with a clearer error message and (b) ideally be made resilient to this configuration, since disabling ASLR is a real (if debatable) practice in some hardened/regulated environments.

從啟動原生 copilot 二進位檔的 Node 包裝器開始，然後使用 copilot --version 或 --help，在 kernel.randomize_va_space=0 的情況下重現該故障。利用報告中的 strace tgkill 行為調查 V8 早期初始化失敗。完成的標準是：CLI 要麼能在停用 ASLR 的情況下執行，要麼回報準確且可操作的 ASLR 相關錯誤，而不是誤導性的 platform-package 訊息。

由索引模型根據 Issue 內容生成。