Function apply 

pub fn apply(root: &mut Value, cfg: &ShapeConfig) -> bool

Applies the active shaping to a serialized payload, in the documented order.

Handles both payload shapes this CLI emits: a bare top-level array (vps list, sftp ls) and an envelope object wrapping a named collection (the batch events). Missing the bare-array case would have left shaping inert on the most frequently used commands.

Returns true when the payload was modified.