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LOTUS_E2EE_INVESTIGATION.md: per-KE capture runbook (console signatures, synapse log greps + SQL against the documented LXC deployment, the KE-1⇒KE-2 causality decision tree, ranked remediations incl. what a crypto-store reset wipes; SDK finding: stable 41.6.0 has no OTK fix over our RC pin). Client: capture-only console ring buffer (cryptoDiagLog, KE-signature-matched, max 200) + a Crypto Diagnostics card in Developer Tools with a download-report button. ClientRoot installs the capture hook at module load and mounts useSessionSync (cross-tab sessions, prior commit). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>