trycmd's Env struct requires env vars under [env.add], not directly
under [env]. Vars placed directly under [env] are silently ignored by
serde, so the subprocess ran with a fully cleared env. On CI this caused
dirs::home_dir() to fall back to passwd, loading the real cli.toml
(with app_id) but without GITHUB_APP_PRIVATE_KEY → partial config error.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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