B2.3 + P11.1 + P11.2 + monster schema fix

B2.3 LatestWinsGate fireAndWait:
  Added fireAndWait(value, ctx?) returning per-fire settlement promise.
  Supersede resolves with frozen sentinel {superseded: true} (no
  rejection — callers branch on value without try/catch). Dispatch
  errors also resolve (with undefined); error surfaces via gate.lastError.
  LatestWinsGate.js 75 → 116 lines. 12/12 tests pass.

P11.1 convert.possibilities(measure):
  New helper returning sorted+deduped unit names for a measure.
  Cached per measure. Reuses existing convert measures map. Also
  exposed convert.measures() listing all known measures.
  convert/index.js +21 lines. New test file: 90 lines, 12/12 tests.

P11.2 commandRegistry.units field:
  Pre-dispatch normalisation pipeline. descriptor.units = {measure,
  default}; commandRegistry extracts msg.payload + msg.unit (3 shapes),
  validates against measure, converts to default, falls back + warns
  with accepted-list on unknown/wrong-measure. Falls back gracefully
  if convert.possibilities is missing. commandRegistry.js 164 → 237.
  +7 new tests covering all 4 paths.

monster schema fix (P11.2 sibling):
  generalFunctions/src/configs/monster.json was stripping four
  legitimate constraint keys (nominalFlowMin, flowMax, maxRainRef,
  minSampleIntervalSec). Added them with defaults matching the
  legacy nodeClass coercion. Side effect: this also UNBLOCKED the
  monster cooldown-guard test (separate ROOT-CAUSE entry below).

CONTRACTS.md §4 + §8 updated. 144/144 basic tests + 206/206 full
generalFunctions tests pass.

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

src/configs/monster.json

@@ -251,6 +251,34 @@
                 "type": "number",
                 "description": "Minimum inner diameter of the intake tubing in millimeters."
             }
+        },
+        "nominalFlowMin": {
+            "default": 0,
+            "rules": {
+                "type": "number",
+                "description": "Lower bound of expected inflow rate (m3/h). Used together with flowMax to scale the rain-driven flow prediction."
+            }
+        },
+        "flowMax": {
+            "default": 0,
+            "rules": {
+                "type": "number",
+                "description": "Upper bound of expected inflow rate (m3/h). Used together with nominalFlowMin to scale the rain-driven flow prediction."
+            }
+        },
+        "maxRainRef": {
+            "default": 10,
+            "rules": {
+                "type": "number",
+                "description": "Reference rain index that maps to the flowMax end of the prediction band."
+            }
+        },
+        "minSampleIntervalSec": {
+            "default": 60,
+            "rules": {
+                "type": "number",
+                "description": "Cooldown between consecutive sample pulses (seconds). Pulses raised faster than this are recorded as missedSamples."
+            }
         }
     }
 }