Plugin hooks get more faithful copies of their arguments

Plugins can attach hooks, small pieces of code that Claude Code runs at certain moments, and Claude Code hands each hook a copy of the relevant data. Before, that copy kept only plain objects and lists, down to a fixed depth. Now:

• toJSON methods (which decide how an object is turned into JSON text) are kept and applied again on the copy
• typed arrays (fixed-type number lists) are copied with structuredClone
• a toJSON that keeps returning something with another toJSON is rejected, with an error starting "a toJSON keeps answering with a value that holds another toJSON, more than"
• a new adoptArgument hook is available