pub fn propagate_opencode_env(cmd: &mut Command)Expand description
Propagate opencode-relevant env vars into a subprocess.
After env_clear(), the subprocess only has PATH and HOME. OpenCode
may need provider API keys (OPENROUTER_API_KEY, ANTHROPIC_AUTH_TOKEN,
etc.), XDG dirs, LANG/TERM for proper operation. This helper forwards
any env var matching the OPENCODE_, OPENROUTER_, XDG_*, LANG, TERM
prefixes from the parent process.