wmic.exe is being removed from Windows — Windows CPU/memory/disk detection will break

Nobody has claimed this yet.

Microsoft has announced that `wmic.exe` (the WMIC command-line tool) is being removed from Windows:
https://support.microsoft.com/en-us/servicing/os/windows/docs/2025/09/windows-management-instrumentation-command-line-wmic-removal-from-windows

`mysqltuner.pl` (current master, v2.9.2) still shells out to `wmic` in several places for Windows system info:

- `wmic cpu get NumberOfCores` (line 2331)
- `wmic cpu get NumberOfLogicalProcessors` (line 2369)
- `wmic ComputerSystem get TotalPhysicalMemory` (line 2905)
- `wmic OS get FreeVirtualMemory` (line 2909)
- `wmic logicaldisk get Name,Size,FreeSpace` (line 5189)
- `wmic os get osarchitecture` (line 6807)

`wmic` is also listed as an allowed command in the system-command regex around line 3255.

Once `wmic.exe` is no longer present (it's already gone on newer Windows builds, and fully removed per the linked schedule), all of these calls will fail, so Windows CPU/memory/disk/architecture detection will silently produce empty/wrong results.

Suggested fix: replace these with PowerShell `Get-CimInstance` equivalents, e.g.:

```powershell
Get-CimInstance Win32_ComputerSystem | Select-Object -ExpandProperty TotalPhysicalMemory
Get-CimInstance Win32_OperatingSystem | Select-Object -ExpandProperty FreePhysicalMemory
Get-CimInstance Win32_Processor | Select-Object -ExpandProperty NumberOfCores
Get-CimInstance Win32_Processor | Select-Object -ExpandProperty NumberOfLogicalProcessors
Get-CimInstance Win32_LogicalDisk | Select-Object Name,Size,FreeSpace
Get-CimInstance Win32_OperatingSystem | Select-Object -ExpandProperty OSArchitecture
```

invoked via `powershell -NoProfile -Command "..."` from Perl, similar to how `wmic` is currently invoked with backticks.

Happy to submit a PR if that's useful.

Start in mysqltuner.pl at the listed WMIC calls around lines 2331, 2369, 2905, 2909, 5189, and 6807, then inspect the allowed-command regex around line 3255. Replace the Windows CPU, memory, disk, and architecture lookups with the suggested PowerShell Get-CimInstance equivalents, and verify that the detection paths still return the expected values without wmic.exe.

Written by the indexing model from the issue text.