Plant page: mature fleet at real cycle times

Rebuild docs/plant-operation.html from the single P1 press into the mature
plant: Newbilt Duplex (two HRP 12 on a VEX 50, EX 35 for splatter), two
Newbilt Classic automatic presses with edge trimmers, label punch and
Granulator 400; Pheenix Alpha PASU, PPPU, two PDPU and PMPB; Sibert VSF,
VSP and VSC in that order; father and mother archive and the stamper rack.

Time runs at 1x real time with speeds up to 3600x. Press cycles are
Newbilt's (Classic 28 s, Duplex ~30 s), plating follows Faraday's law at
the PDPU current, and the operator steps use the galvanics.md table, with
unpublished times marked as estimates. Titles flow through the three artist
gates in days; test pressings unmount and the presses run approved work
meanwhile; worn stampers and represses come from the archived mothers.
Two shifts, unplanned press stops sized to scale.md's 60 to 70 %
effectiveness, and demos for a steam dip, a new PVC lot and a repress.

The boiler and chiller are shown at 800 kg/h and 500 kW (estimates) and
the detail panels flag that scale.md's 400 kg/h and 250 kW are Duplex
figures; scale.md itself is unchanged.

Also commits the galvanics.md cycle-time table the page runs on (one PDPU
covers demand, the second is redundancy) and updates the README and the
test-site descriptions.

site/public/index.html

@@ -54,11 +54,13 @@
     <li>
       <a href="demos/plant-operation/">
         <strong>Plant overview (simulated SCADA)</strong>
-        <span>The whole plant animated, from PVC intake and the material lab
-        through extruder, press, trim, optical inspection, finishing,
-        packaging and fulfillment, with the metal path, utilities and energy
-        alongside. Every station is clickable; on a phone, turn it sideways
-        and pinch to zoom.</span>
+        <span>The mature plant animated at real cycle times: Newbilt Duplex
+        and Classic presses, Pheenix Alpha electroforming and Sibert stamper
+        prep, from PVC intake and the material lab through pressing,
+        inspection, packaging and fulfillment, with the artist gates,
+        utilities and energy alongside. Real time up to a day in 24 s;
+        every station is clickable; on a phone, turn it sideways and pinch
+        to zoom.</span>
       </a>
     </li>
   </ul>