AI Dev Tool: Passkeys are a trap

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Preview Code

```rust
// AI Dev Tool: Hono Cloudflare Worker Passkey Authenticator
// ================================================
// This is a production-ready developer code asset that provides a Hono Cloudflare Worker
// template for Passkey authentication. It includes a Rust WebAssembly Edge Function and
// integrates with the Hono Cloudflare Workers D1 Starter.

use std::collections::HashMap;
use std::error::Error;
use std::fmt;

// Define a custom error type for Passkey authentication errors
#[derive(Debug)]
enum PasskeyAuthError {
    InvalidPasskey,
    AuthenticationFailed,
}

impl fmt::Display for PasskeyAuthError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            PasskeyAuthError::InvalidPasskey => write!(f, "Invalid Passkey"),
            PasskeyAuthError::AuthenticationFailed => write!(f, "Authentication failed"),
        }
    }
# ... full runnable version includes tests & documentation