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Let's Encrypt Generation Y chains sign a P-256 leaf with the P-384 intermediate YE1 under ISRG Root YE. mqtt.meshtastic.org switched to this chain on 2026-07-29. With CONFIG_MBEDTLS_ECP_DP_SECP384R1_ENABLED=n mbedtls cannot parse the peer chain and the TLS handshake aborts with MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE, breaking MQTT over TLS on every ESP32 target. Costs about 4 kB of flash. Fixes #11316