Lets an AI agent or CLI session sign in to Internet Identity and act as a user's app-specific principal (e.g. for oisy.com or nns.ic0.app) via `icp identity link web`. Use when the user asks an agent to log in to an II-powered app, obtain a delegation, or make authorized canister calls on their behalf. Do NOT use for adding II sign-in to a frontend — use the internet-identity skill instead.
