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Blackboard sessions are now cached across CLI commands with encrypted, account-scoped cookie storage. Cached sessions are checked against the selected account, expired sessions can authenticate again, and logout clears the profile's cache. Write requests are never replayed after session expiry.
Browser authentication supports Chrome, Edge, and Chromium selection, plus explicit loopback CDP attachment to reuse an existing browser session. The CLI preserves the browser and its pre-existing tabs.
Validation: 495 local tests, cross-platform CI, actual Chrome for Testing and Edge CDP import and subsequent CLI cache reuse with zero CAS password submissions.
See docs/AUTHENTICATION.md for setup and CDP requirements.