docs: add passwordless authentication example and guide - #875
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Document how to use Auth0 passwordless (email/SMS) via Universal Login, using the connection and login_hint authorization parameters. No SDK code change is needed: authorizationParams already forwards these to the /authorize request. Adds examples/passwordless.js (email and SMS routes) and EXAMPLES.md section 18, including the same-device-only limitation for magic links.
…omment - Add returnTo: '/' to both login routes to prevent a redirect loop after callback (without it the SDK returns to the login route which unconditionally calls res.oidc.login() again) - Update run command from node examples/run_example.js to npm run start:example - Convert single-line comment block to multiline /* */ style
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Description
Documents how to use Auth0 passwordless authentication (email one-time code, SMS one-time code, and email magic link) with `express-openid-connect` via Universal Login.
Passwordless is driven entirely through Universal Login: Auth0 hosts the page that sends and collects the code or link. The SDK only needs to signal which connection to use via the `connection` authorization parameter (and optionally prefill the identifier with `login_hint`). Because `authorizationParams` already forwards arbitrary parameters to the `/authorize` request, no SDK code change is required — this PR is documentation and a runnable example only.
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