execFileSync with a bare command name on Windows does not consult
PATHEXT — it only finds literal .exe files. CLIs installed via
npm install -g land at %APPDATA%\npm\<name>.cmd, which detect() can't
see, so AO reports the agent as not installed.
Add shell: isWindows() so cmd.exe handles PATHEXT and finds .cmd shims.
Adds windowsHide: true while we're there to suppress conhost flashes.
Affects all 5 agent plugins: aider, claude-code, codex, cursor, opencode.
Reproduced with codex installed via npm on a Windows EC2 box where
where.exe codex resolved to codex.cmd but detect() returned false.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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