pub fn harvest(body: &[u8]) -> (Vec<String>, u64)Expand description
Harvest human-text from any provider-native request JSON: walks the value,
collecting strings under text-ish keys (text, content, instructions,
string-form system, gemini parts text) plus tool definitions serialized.
Returns (texts, message_count) where message_count is the length of
the largest messages / contents / input array found (0 if none).