fix(quickemu): read "Vendor ID" for CPU vendor detection

[flexiondotorg]

• Change HOST_CPU_VENDOR lookup to use '^Vendor ID' when parsing /proc/cpuinfo
• Ensures correct CPU vendor detection on systems that label the field as 'Vendor ID' instead of 'Vendor'

Fixes #1845

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have performed a self-review of my code

[cubic-dev-ai]

1 issue found across 1 file

Confidence score: 3/5

• There is a concrete macOS regression risk: get_cpu_info exits when it sees the new ^Vendor ID lookup, which is only valid for Linux, so macOS hosts may fail to detect CPU info.
• Given the 7/10 severity and high confidence, this adds some user-facing risk despite being a small change.
• Pay close attention to quickemu - keep the Linux-only Vendor ID pattern off macOS to avoid unknown key exits.

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="quickemu">

<violation number="1" location="quickemu:480">
P1: The new '^Vendor ID' lookup breaks macOS because get_cpu_info only recognizes "Vendor" for Darwin and exits on unknown keys. Use the Linux-only pattern for Linux hosts and keep "Vendor" on macOS.</violation>
</file>

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