Azure client secrets lapse silently into opaque 401s (AADSTS7000222). Add a self-reported expiry date (SP_SECRET_EXPIRES=YYYY-MM-DD) and a shared secretExpiryStatus() helper in graph.mjs; surface warnings <30 days out via the CLI (stderr on every command + test output), MCP server startup log, /health, and the sharepoint_test tool. Documented in both .env.examples, setup.md, and READMEs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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