perf(build): enable release O2 optimization

[zjwhitehead]

Summary

• build the ESP32-S3 production environment in release mode
• select ESP-IDF performance optimization (-O2) in both the checked config and defaults
• keep compiler assertions enabled at level 2
• exclude all benchmark instrumentation

Verification

• pio test -e native-test: 60/60 passed
• pio test -e native-screenshot: 34/34 passed using the known harness options missing from current master; those temporary harness edits are not in this PR
• pio run -e OpenPPG-CESP32S3-CAN-SP140: passed
• compile database: 1,448 of 1,449 compile commands contain -O2
• target size: 120,080 bytes RAM; 1,165,885 bytes flash

ESP-IDF 4.4 note

CONFIG_FREERTOS_TASK_FUNCTION_WRAPPER depends on CONFIG_COMPILER_OPTIMIZATION_DEFAULT in this IDF version, so Kconfig disables the wrapper when -O2 is selected. Task entry points must continue to avoid returning. Assertions remain enabled at level 2.

Hardware acceptance

Before flight release, smoke-test boot, BLE, display, idle telemetry, arm/disarm, cruise, OTA validation, and live ESC/BMS traffic on the optimized binary.