ReadonlyallowWhether a NON-ESSENTIAL DSP add (extra EQ band, extra tap) should proceed.
Optional ReadonlybusyThe smoothed busy ratio the verdict was computed from, when a reading existed.
Optional ReadonlycodedThe operator-facing message as a translatable CODE + its parameters — what a UI renders. Present exactly when busyRatio is: no reading, nothing to say.
ReadonlylevelOptional ReadonlymessageEnglish log/debug fallback sentence; UIs render coded instead.
One headroom assessment.
busyRatioandmessageare present only when a reading existed — an engine with no measurement yields the permissive{ level: 'ok', allowNonEssentialDspAdd: true }(no signal is not danger; the same stance the adaptive-quantum policy takes on a missing load reading). The guard consuming task #120's add-band seam should read allowNonEssentialDspAdd. Display surfaces render their own sentence from busyRatio + level (the web-ui translates them through its message catalog — core never emits display prose as a contract); message is the English log/debug fallback.