Steam and cooling plant for the five-press fleet; utilities re-based

New page docs/steam-cooling.html (site /demos/steam-cooling/): the
utility plant as a clickable process diagram. Steam side: raw water,
softener and dosing, feed tank with heat-pump feedwater recovery, feed
pumps, a bank of two 500 kg/h boilers (third for N+1 as an option),
separator and metering, optional accumulator, blowdown, the 10 bar
header with a valved, metered branch and trap per press, drip legs and
condensate return. Cooling side: Newbilt's press outlets are open (max.
2 bar), so returns drain to a warm tank, pass the heat pump, an optional
dry cooler and a plate heat exchanger to a cold buffer tank, and VFD
pumps feed the 20 to 25 C header at ~10 bar to every press, the
extruders and the central hydraulic oil cooler; the chiller loop
(three 250 kW air-cooled modules at 40 C ambient, fourth as option) stays
closed and clean. Galvanics cooling (12 to 20 C) is a separate circuit.
Operating cases (launch, Duplex system 1, five presses, one module down)
show demand against installed capacity; design basis with sources,
equipment schedule, RFQ questions. Static SVG, no per-frame work.

Design basis at Newbilt's per-machine figures: steam 750 to 900 kg/h,
cooling 652.5 kW (625 presses, 15 extruders, 12.5 hydraulics), 305 to
540 l/min circulating. Also found: Newbilt's 53 l/min at ~60 C out is
~140 kW, above its 125 kW peak; listed as a re-quote question.

Re-based in the same commit:
- scale.md: electrical table (chiller bank ~210 to 325 kW electrical,
  plant peak ~430 to 700 kW, ~950 to 1,330 kW with electric steam),
  grid 800 to 1,000 kVA (1,250 to 1,600 with electric steam, Schedule
  4 past 1,000 kW), tariff 4.5M to 6.8M THB/yr, battery ~1 h of chiller
  peak, boiler and chiller banks, biomass up to ~550 t/yr at 1.5 M
  records, utilities money line.
- sustainability.md, biomass.md: same figures; electric steam 5.2M to
  6.0M THB/yr mature, 1.6M to 1.8M early; fuel saving 4.0M to 5.4M.
- utilities CSV: boiler bank, chiller bank with HX and tanks, softener
  and loop treatment re-sized; baseline 23.98M-41.63M -> 30.07M-51.33M.
- total-investment.md: re-size as an added-scope row (+185k / +294k
  USD); headline 4.7M to 8.9M unchanged until the investment re-base.
- pressing-line, equipment-suppliers, facility-security, fleet
  calculator (boiler 1000 kg/h, chiller 750 kW), plant page detail
  texts; README, landing page, build.sh.

docs/fleet-calculator.html

@@ -473,7 +473,7 @@ grp("Stamper making", [
 grp("Energy", [
   ["kwhPrice", "Electricity, blended", 3.81, "THB/kWh", "doc", "scale.md: PEA TOU 3.2.2 at two shifts, before the demand charge (Ft September to December 2026)"],
   ["demandPrice", "Demand charge", 132.93, "THB/kW a month", "doc", "PEA 3.2.2 (scale.md)"],
-  ["restKW", "Rest of the plant while running", 120, "kW", "est", "Estimate: HVAC, lighting, galvanics, finishing, offices; puts the start fleet in scale.md's 4.3 to 6.4M THB a year before PV"],
+  ["restKW", "Rest of the plant while running", 120, "kW", "est", "Estimate: HVAC, lighting, galvanics, finishing, offices; puts the start fleet in scale.md's 4.5 to 6.8M THB a year before PV"],
   ["pvKWp", "Roof PV", 247, "kWp", "doc", "scale.md"],
   ["pvYield", "PV yield, all self-consumed", 1400, "kWh/kWp", "doc", "scale.md: 1,400 to 1,500 kWh/kWp a year in northern Thailand"],
   ["heatPrice", "Steam heat from biomass", 0.7, "THB/kWh", "doc", "biomass.md: 0.5 to 0.9 at 1.35 to 2 THB/kg delivered"],
@@ -506,8 +506,8 @@ grp("Workwear: Engelbert Strauss for all staff", [
   ["wwDuty", "Thai import duty on workwear", 14, "%", "doc", "HS 6203 work trousers 13.8 % (customs-compliance.ai, March 2026); BOI does not cover clothing; import VAT reclaimable"],
 ]);
 grp("Planned plant, for the checks", [
-  ["boiler", "Steam boiler", 400, "kg/h", "doc", "scale.md: sized for one Duplex system"],
-  ["chiller", "Chiller", 250, "kW", "doc", "scale.md: sized for one Duplex system"],
+  ["boiler", "Steam boiler bank", 1000, "kg/h", "doc", "steam-cooling.html and scale.md: 2 × 500 kg/h modules (proposal, estimate)"],
+  ["chiller", "Chiller bank", 750, "kW", "doc", "steam-cooling.html and scale.md: 3 × 250 kW air-cooled modules (proposal, estimate)"],
   ["hall", "Payap press hall", 870, "m²", "doc", "site-candidates.md, Payap scenario model"],
 ]);
 const A0 = Object.fromEntries(AS.map(r => [r[1], r[3]]));