docs: guide for shared sessions across subdomains - #147
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Explains signing in once across sibling subdomains: a shared derivationOrigin for one principal, a SyncCookieStorage to share sign-in state, and a silent prompt=none sign-in to acquire the session on an app that does not have it yet. Covers the redirect callback allow-list, cross-app sign-out, and reacting to sign-in/out in other tabs via AuthClient.subscribe. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Adds a guide explaining how to sign in once across sibling subdomains of one domain: a shared
derivationOriginfor one principal, aSyncCookieStorageto share sign-in state, and a silentprompt: 'none'sign-in to acquire the session on an app that does not have it yet.Covers configuring each app, the
'redirect'transport's/.well-known/ii-auth-callbacksrequirement, sign-in / sign-out, acquiring the session on page load, and reacting to changes in other tabs and apps viaAuthClient.subscribe.