configs(pumpingStation): realistic basin defaults + ramp-foot clarification

Schema defaults now match a realistic 50 m³ × 4 m basin (volume=50,
height=4, inflowLevel=1.5, overflowLevel=3.8, maxLevel=3.8, minLevel=0.3).
stopLevel default stays null so the hysteresis remains opt-in for
programmatic configs (per levelBased.js:111-113); the editor HTML supplies
0.5 m as the drag-in default.

startLevel description corrected: the ramp foot is inflowLevel, not
startLevel — demand stays at 0 % across [startLevel, inflowLevel] and
scales 0 → 100 % across [inflowLevel, maxLevel]. The previous text claimed
[startLevel, maxLevel], contradicting the runtime.

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

src/configs/pumpingStation.json

@@ -267,14 +267,14 @@
     },
     "basin": {
         "volume": {
-            "default": "1",
+            "default": 50,
             "rules": {
                 "type": "number",
                 "description": "Total volume of empty basin in m3"
             }
         },
         "height": {
-            "default": "1",
+            "default": 4,
             "rules": {
                 "type": "number",
                 "description": "Total height of basin in m"
@@ -288,11 +288,11 @@
             }
         },
         "inflowLevel": {
-            "default": 2,
+            "default": 1.5,
             "rules": {
                 "type": "number",
                 "min": 0,
-                "description": "Bottom/invert height of the inlet pipe measured from the basin floor (m)."
+                "description": "Bottom/invert height of the inlet pipe measured from the basin floor (m). Acts as the ramp foot in levelbased control: demand stays at 0 % below inflowLevel and scales 0 → 100 % across [inflowLevel, maxLevel]."
             }
         },
         "outflowLevel": {
@@ -304,7 +304,7 @@
             }
         },
         "overflowLevel": {
-            "default": 2.5,
+            "default": 3.8,
             "rules": {
                 "type": "number",
                 "min": 0,
@@ -486,7 +486,7 @@
         },
         "levelbased": {
             "minLevel": {
-                "default": 1,
+                "default": 0.3,
                 "rules": {
                     "type": "number",
                     "min": 0,
@@ -498,7 +498,7 @@
                 "rules": {
                     "type": "number",
                     "min": 0,
-                    "description": "Pump-on threshold and ramp foot. Below this level demand is 0 %; at or above it demand scales 0 → 100 % across [startLevel, maxLevel] using the configured curve (linear or log). When enableShiftedRamp is on, this also serves as the bottom of the held-then-ramp curve during draining."
+                    "description": "Pump-on threshold (engagement edge for stopLevel hysteresis). Demand stays at 0 % between startLevel and inflowLevel — the ramp foot is inflowLevel, not startLevel. The ramp itself scales 0 → 100 % across [inflowLevel, maxLevel]. When enableShiftedRamp is on, startLevel also serves as the bottom of the held-then-ramp curve during draining."
                 }
             },
             "stopLevel": {
@@ -507,11 +507,11 @@
                     "type": "number",
                     "nullable": true,
                     "min": 0,
-                    "description": "Optional pump-off threshold. When set, PS sends an explicit turnOffAllMachines command to MGC the moment level drops below stopLevel. Independent of the ramp scaling — does NOT shift where the ramp starts. Pair with a startLevel above stopLevel to get hysteresis (pumps engage at startLevel rising, disengage at stopLevel falling). Must be ≥ minLevel and ≤ startLevel."
+                    "description": "Optional pump-off threshold. When set, PS sends an explicit turnOffAllMachines command to MGC the moment level drops below stopLevel. Independent of the ramp scaling — does NOT shift where the ramp starts. Pair with a startLevel above stopLevel to get hysteresis (pumps engage at startLevel rising, disengage at stopLevel falling). Must be ≥ minLevel and ≤ startLevel. NOTE: schema default stays null so omitting stopLevel keeps the hysteresis inactive (matching levelBased.js); the editor HTML provides a realistic 0.5 m default for drag-in UX."
                 }
             },
             "maxLevel": {
-                "default": 4,
+                "default": 3.8,
                 "rules": {
                     "type": "number",
                     "min": 0,