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Records that the pure-managed P-256 ExchangeKey works (cleared the v8 client-key check; error advanced to 132/171 AuthenticationFailed). The remaining layer is the 26-byte credential-token KDF, which requires recovering the native key derivation. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC