[codex] Handle Git for Windows outside inherited PATH

[paulreginaphoto]

Summary

• add a dedicated Git detection helper that keeps the existing PATH probe
• on Windows, fall back to standard Git for Windows install locations under Program Files
• use the helper for both fresh-install and installed-state validation

Root Cause

ComfyUI Desktop validated Git with only an inherited shell PATH check. On Windows, launching from Explorer can inherit a stale PATH after Git or the Desktop app has been installed or updated, causing a false "Git is missing" maintenance page even when Git is installed.

Fixes #1702

Validation

• npx vitest run tests/unit/utils.test.ts tests/unit/install/installationManager.test.ts
• npx eslint --max-warnings 0 src tests/unit/utils.test.ts tests/unit/install/installationManager.test.ts
• npx tsc -p tsconfig.json --noEmit

┆Issue is synchronized with this Notion page by Unito

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