Small labelling additions for web fetches, hook timing and cloud session setup

Three small additions:

• Web page fetches: a fetch result is now marked when its content is text extracted from the page.
• Hook timing: Claude Code records a new timing for the first message involving a hook. A hook is a command you set to run at set moments.
• Cloud session setup: when Claude Code reports on setting up a cloud session's home settings, it can now give the reason not_for_runner.