Run with: cargo run -p magnotia-core --example tuning_log_demo Initialises a tracing-subscriber fmt layer so the inference_thread_count INFO event is rendered to stderr. Exercises all 8 (workload, gpu_offloaded) combos under three power scenarios: AC override, battery override, and the real sysfs probe. Used to validate the heuristic on 2026-05-09 against the spec's 6c12t truth table — all 6 rows match. Adds tracing-subscriber as a [dev-dependencies] for the example. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>