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### Guardrails (specificClass.js) New _validateThresholdOrdering() runs in the constructor. Checks every ordered pair of basin + control + derived-safety levels and logs a warning for each violation; returns the list as this.thresholdIssues so tests and the eval harness can inspect. Non-fatal — we prefer a running-but-warned station to a refusal-to-start (availability-first). Strict invariants (bottom → top): 0 < outflowLevel < inflowLevel < overflowLevel ≤ basinHeight dryRunLevel ≤ minLevel ≤ startLevel < maxLevel ≤ overfillLevel Uses a list-of-checks pattern rather than a switch — easier to add new invariants without reflowing cases, and the list itself is readable documentation. ### Bug fix (specificClass.js) calibratePredictedLevel was writing the volume value into the LEVEL slot. Root cause: MeasurementContainer is stateful — its type()/ variant()/position() calls mutate the container's own cursor, so caching chain references (const levelChain = ...; const volumeChain = ...) doesn't isolate them. The second cached chain ended up sharing the state of the last type() call. Rebuilt chains fresh each time, matching the calibratePredictedVolume pattern that already worked. ### Tests (test/basic/specificClass.test.js) Ported from Jest to node:test + node:assert — the project's standard per .claude/rules/testing.md. Deleted the stale test/specificClass.test.js (tests referenced methods that no longer exist post-rename). New coverage, 42 passing subtests: - Basin geometry derivations + minHeightBasedOn - Level/volume roundtrip - Threshold guardrails (5 violation cases) - Direction derivation - Mode change accept/reject - Calibration (volume and level paths — catches the bug above) - Levelbased control zones (STOP / DEAD ZONE / RAMP / saturate) - getOutput flattening - setManualInflow Run with: node --test test/basic/*.test.js Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>