Labels are pressed into the record, not applied at finishing

The docs and the plant page had labelling as a finishing step after the
press. On a record press the bottom label, the cake and the top label go
in between the stampers every cycle and the mold bonds the paper into the
vinyl; the oven only pre-dries them. Corrected everywhere the process is
described:

- process-flow.md: labels are a parallel input to pressing with their own
  row (print inspection, oven, lot per cycle); stage 6 loads label, cake,
  label; stage 7 is trim, sleeve, shrink
- process-flow.drawio (+ regenerated png/pdf): label input now feeds
  stage 6, not stage 7
- README vision list and the business plan source (regenerated docx/pdf):
  pressing paragraph explains the pressed-in label, finishing no longer
  claims to label
- plant-operation.html: label dry oven station feeds two label discs
  into the press with every cake, the cake in the mold shows its labels,
  the cycle log records the label lot, finishing is sleeve + shrink

docs/process-flow.drawio

@@ -61,7 +61,7 @@
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           <mxGeometry x="680" y="860" width="260" height="80" as="geometry" />
         </mxCell>
-        <mxCell id="c6b" value="Check: 100% inline optical inspection (non-fill, stitching, warp, concentricity, label)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontSize=10;align=left;spacing=6;" vertex="1" parent="1">
+        <mxCell id="c6b" value="Check: 100% inline optical inspection (non-fill, stitching, warp, concentricity, label identity and centering)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontSize=10;align=left;spacing=6;" vertex="1" parent="1">
           <mxGeometry x="680" y="960" width="260" height="80" as="geometry" />
         </mxCell>
         <mxCell id="c6c" value="Check: sampled automated audio comparison vs master (first-offs, every Nth, stamper age)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontSize=10;align=left;spacing=6;" vertex="1" parent="1">
@@ -70,11 +70,11 @@
         <mxCell id="g3" value="Artist gate: test pressing approved before production run" style="rhombus;whiteSpace=wrap;html=1;fillColor=#e1d5e7;strokeColor=#9673a6;fontSize=10;" vertex="1" parent="1">
           <mxGeometry x="380" y="1010" width="200" height="80" as="geometry" />
         </mxCell>
-        <mxCell id="s7" value="7. Finishing: trimming, label, dry oven, shrink wrap" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=12;" vertex="1" parent="1">
+        <mxCell id="s7" value="7. Finishing: trimming, sleeving, shrink wrap" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=12;" vertex="1" parent="1">
           <mxGeometry x="340" y="1130" width="280" height="70" as="geometry" />
         </mxCell>
-        <mxCell id="m3" value="Labels (printed; print inspection upstream)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=10;" vertex="1" parent="1">
-          <mxGeometry x="40" y="1200" width="230" height="50" as="geometry" />
+        <mxCell id="m3" value="Labels: print inspected, pre-dried in oven, loaded with the cake each cycle" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=10;" vertex="1" parent="1">
+          <mxGeometry x="40" y="1190" width="230" height="60" as="geometry" />
         </mxCell>
         <mxCell id="c7" value="Check: shrink and final visual (sampled)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontSize=10;align=left;spacing=6;" vertex="1" parent="1">
           <mxGeometry x="680" y="1160" width="260" height="50" as="geometry" />
@@ -160,7 +160,7 @@
         <mxCell id="e15" style="html=1;strokeColor=#82b366;strokeWidth=2;" edge="1" parent="1" source="a2" target="s6">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
-        <mxCell id="e16" style="html=1;strokeColor=#82b366;strokeWidth=2;" edge="1" parent="1" source="m3" target="s7">
+        <mxCell id="e16" style="html=1;strokeColor=#82b366;strokeWidth=2;" edge="1" parent="1" source="m3" target="s6">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
         <mxCell id="e17" style="html=1;strokeColor=#82b366;strokeWidth=2;" edge="1" parent="1" source="m4" target="a3">