P6: convert monster to BaseDomain + BaseNodeAdapter + concern split

Refactor of monster to use the platform infrastructure (BaseDomain, BaseNodeAdapter,
ChildRouter, commandRegistry, statusBadge). Extracts concerns into
focused modules per .claude/refactor/MODULE_SPLIT.md generic template.
Tests stay green; CONTRACT.md generated; legacy aliases preserved.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/parameters/parameters.js

@@ -0,0 +1,56 @@
+'use strict';
+
+// Sampling-cabinet boundary + target math + rain-scaled flow prediction.
+// All operations are pure given a domain handle — the domain owns the
+// mutable fields (maxVolume, targetPuls, …) so legacy tests that read
+// `monster.maxVolume` keep working.
+
+const RAIN_STALE_MS = 2 * 60 * 60 * 1000;
+
+function applyBoundsAndTargets(m) {
+  m.maxVolume = m.maxWeight - m.emptyWeightBucket;
+  m.minPuls = Math.round(m.minVolume / m.volume_pulse);
+  m.maxPuls = Math.round(m.maxVolume / m.volume_pulse);
+  m.absMaxPuls = Math.round(m.cap_volume / m.volume_pulse);
+  m.targetVolume = m.minVolume * Math.sqrt(m.maxVolume / m.minVolume);
+  m.targetPuls = Math.round(m.targetVolume / m.volume_pulse);
+}
+
+function validateFlowBounds(m) {
+  const min = Number(m.nominalFlowMin);
+  const max = Number(m.flowMax);
+  const valid = Number.isFinite(min) && Number.isFinite(max) && min >= 0 && max > 0 && min < max;
+  m.invalidFlowBounds = !valid;
+  if (!valid) m.logger.warn(`Invalid flow bounds. nominalFlowMin=${m.nominalFlowMin}, flowMax=${m.flowMax}`);
+  return valid;
+}
+
+function getRainIndex(m) {
+  if (!m.lastRainUpdate) return 0;
+  if (Date.now() - m.lastRainUpdate > RAIN_STALE_MS) return 0;
+  return Number.isFinite(m.avgRain) ? m.avgRain : 0;
+}
+
+function getPredictedFlowRate(m) {
+  const min = Number(m.nominalFlowMin);
+  const max = Number(m.flowMax);
+  if (!Number.isFinite(min) || !Number.isFinite(max) || min < 0 || max <= 0 || min >= max) return 0;
+  const rainIndex = getRainIndex(m);
+  const scale = Math.max(0, Math.min(1, m.rainMaxRef > 0 ? rainIndex / m.rainMaxRef : 0));
+  return min + (max - min) * scale;
+}
+
+function getSampleCooldownMs(m) {
+  if (!m.lastSampleTime) return 0;
+  const remaining = (m.minSampleIntervalSec * 1000) - (Date.now() - m.lastSampleTime);
+  return Math.max(0, remaining);
+}
+
+module.exports = {
+  applyBoundsAndTargets,
+  validateFlowBounds,
+  getRainIndex,
+  getPredictedFlowRate,
+  getSampleCooldownMs,
+  RAIN_STALE_MS,
+};