Function toml_encode_pretty_compact 

pub fn toml_encode_pretty_compact<T: Serialize>(value: &T) -> Result<String>

Render a value as pretty TOML with:

• Keys sorted alphabetically at every nesting level.
• Empty tables emitted inline as {} rather than as a [name] header. Empty arrays already render inline as [] via the default toml serializer, so no special handling is needed.

Useful for human-readable diagnostic output where stable scan-friendly ordering matters and empty-table headers would add visual noise.