[rust] fix Windows architecture detection under WOW64 - #17987

• Detect native Windows architecture through GetNativeSystemInfo, including WOW64 hosts.
• Map x86, ARM, and default 64-bit results to Selenium architecture identifiers.
• Remove environment-based detection that incorrectly forced x64 downloads.

graph TD
    A["Manager config"] --> B{"Windows host?"} -->|Yes| C["Native system info"] --> D{"CPU architecture"}
    B -->|No| H["uname detection"]
    D -->|Intel| E["x86 target"]
    D -->|ARM or ARM64| F["ARM64 target"]
    D -->|Other| G["x64 target"]

Loading

The direct GetNativeSystemInfo approach is appropriate because it reports the native host architecture even when Selenium Manager runs under WOW64. Environment variables report process architecture, while PowerShell adds unnecessary startup overhead; neither is preferable for this requirement.

Bug fix (1) +15 / -26

config.rsDetect the native Windows architecture through WinAPI +15/-26

Detect the native Windows architecture through WinAPI

• Replaces 'PROCESSOR_ARCHITECTURE' parsing with 'GetNativeSystemInfo', ensuring WOW64 processes detect the host architecture rather than the executable architecture. Maps Intel to x86, ARM variants to ARM64, and remaining architectures to x64, with a non-Windows compilation stub.

rust/src/config.rs

Description

get_win_os_architecture maps native processor values to x86, ARM64, or x64 without any focused
test covering those branches. A future mapping change can therefore select incompatible browser and
driver binaries without being detected by the existing generic architecture tests.

Code

rust/src/config.rs[R366-369]

+            si if si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_INTEL => ARCH_X86,
+            si if si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_ARM
+                || si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_ARM64 =>
+            {

Evidence

PR Compliance ID 4 requires focused tests for changed behavior. The cited implementation introduces
multiple Windows architecture branches, while the PR changes no test file and repository search
found no test or other invocation of get_win_os_architecture.

AGENTS.md: Add Focused Tests for Implemented Behavior
rust/src/config.rs[359-375]
rust/tests/config_unit_tests.rs[73-100]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The new Windows native processor-architecture mapping has no focused test coverage.

## Issue Context
Extract the processor-value conversion into a testable function and cover Intel, ARM, ARM64, AMD64, and unknown values without requiring each architecture in CI.

## Fix Focus Areas
- rust/src/config.rs[359-375]
- rust/tests/config_unit_tests.rs[73-100]

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