[DO NOT MERGE] feat(userinfo): add getUserInfo() to auth0-auth-js and auth0-server-js

[tusharpandey13]

Summary

• Adds OIDC /userinfo support (gap G8 — last open item in the node-auth0 authentication-separation parity set).
• auth0-auth-js: AuthClient.getUserInfo(options) — stateless live fetch via openid-client fetchUserInfo; optional expectedSubject (defaults to skipSubjectCheck). New UserInfoError, GetUserInfoOptions, and an auth0-owned UserInfoResponse interface (only sub required + catch-all index signature) for a stable public contract independent of the openid-client version.
• auth0-server-js: ServerClient.getUserInfo(storeOptions?) — live fetch using the session access token with automatic refresh. Throws MissingSessionError on no session / missing user sub / resolver-mode domain mismatch; resolves the per-domain AuthClient in resolver mode; always passes the session sub as expectedSubject for an OIDC subject-consistency check. Re-exports UserInfoError.

Additive, minor version bump in both packages. No breaking changes.

Design notes

• getUserInfo() is a live network call — distinct from the existing getUser(), which returns cached ID-token claims. Documented in EXAMPLES.md.
• Server layer passes the session sub to openid-client so a token/session subject mismatch is caught automatically (stronger than node-auth0).
• Resolver-mode delegation uses #getAuthClient(domain) (mirrors logout / revokeRefreshToken), because this.authClient is only available for a static-domain configuration.

Test plan

• auth0-auth-js: 12 unit tests (success, 401/403, network error, subject match/mismatch, skip-subject default, missing endpoint) — MSW HTTP layer
• auth0-server-js: 11 unit tests (fresh/refresh success, no session, no-user guard, resolver match/mismatch, sub consistency/mismatch, refresh fail, session expiry, post-refresh 401)
• npm run build / npm run lint pass both packages
• Full suites green: 372 (auth-js) + 383 (server-js)

Risk

/userinfo shows 89.1% success over 90d (lowest of the ported endpoints) — likely benign (401s from expired/invalid access tokens). Cross-check the grant-type/endpoint telemetry stitch before GA. Non-blocking for merge.

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Review details

⚙️ Run configuration

Configuration used: defaults

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Run ID: 4c5cc958-0fa6-4d96-942e-e22b92e3d0a8

📥 Commits

Reviewing files that changed from the base of the PR and between 60d0e42 and 49ba3df.

📒 Files selected for processing (9)

• packages/auth0-auth-js/EXAMPLES.md
• packages/auth0-auth-js/src/auth-client.spec.ts
• packages/auth0-auth-js/src/auth-client.ts
• packages/auth0-auth-js/src/errors.ts
• packages/auth0-auth-js/src/types.ts
• packages/auth0-server-js/EXAMPLES.md
• packages/auth0-server-js/src/index.ts
• packages/auth0-server-js/src/server-client.spec.ts
• packages/auth0-server-js/src/server-client.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/userinfo-g8

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