* fix(google-gemini-cli-auth): fix Gemini CLI OAuth failures on Windows
Two issues prevented Gemini CLI OAuth from working on Windows:
1. resolveGeminiCliDirs: the first candidate `dirname(dirname(resolvedPath))`
can resolve to an unrelated ancestor directory (e.g. the nvm root
`C:\Users\<user>\AppData\Local\nvm`) when gemini is installed via nvm.
The subsequent `findFile` recursive search (depth 10) then picks up an
`oauth2.js` from a completely different package (e.g.
`discord-api-types/payloads/v10/oauth2.js`), which naturally does not
contain Google OAuth credentials, causing silent extraction failure.
Fix: validate candidate directories before including them — only keep
candidates that contain a `package.json` or a `node_modules/@google/
gemini-cli-core` subdirectory.
2. resolvePlatform: returns "WINDOWS" on win32, but Google's loadCodeAssist
API rejects it as an invalid Platform enum value (400 INVALID_ARGUMENT),
just like it rejects "LINUX".
Fix: use "PLATFORM_UNSPECIFIED" for all non-macOS platforms.
* test(google-gemini-cli-auth): keep oauth regressions portable
* chore(changelog): add google gemini cli auth fix note
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Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
