fix(auth): reject Entra guest accounts

[lorenzocorallo]

Summary

• Reject Entra sign-ins unless the ID token includes acct: 0, excluding B2B guest accounts and tokens without the claim.
• Document the required Entra app registration claim and deployment impact.
• Add policy tests for member, guest, malformed, and missing acct values.

Testing

• Not run (no test execution information provided).

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 03f44d5 and c4e63de.

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📒 Files selected for processing (4)

• README.md
• src/auth/policy.test.ts
• src/auth/policy.ts
• src/auth/providers.ts

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• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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