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.md

@@ -22,9 +22,10 @@ flowchart TD
     E --> F[6. Pressing]
     PVC[PVC compound intake] --> LAB[Material lab gate] --> F
     REG[Regrind stream] --> LAB
+    LBL[Labels: print inspected,<br/>pre-dried in oven] --> F
     F --> G3{Artist gate:<br/>test pressing approved}
     G3 --> F2[Production run]
-    F2 --> H[7. Finishing<br/>trim, label, shrink]
+    F2 --> H[7. Finishing<br/>trim, sleeve, shrink]
     H --> I[8. Packaging<br/>and assembly]
     CART[Cartons and sleeves<br/>from local partners] --> PQC[Packaging incoming QC] --> I
     I --> J[9. Fulfillment<br/>warehouse, bulk, dropshipping]
@@ -47,8 +48,9 @@ flowchart TD
 | 4 | Silvering and electroforming | Bath chemistry logs per batch; XRF nickel thickness per part; confocal/profiler groove metrology on sampled radial zones; mother listening check (mothers are playable); laser Data Matrix marks on part backs | |
 | 5 | Stamper prep | Concentricity and dimensional checks after punch, back-finish, and coining; visual inspection | |
 | M | PVC intake (parallel input) | Material lab gate per lot: certificate of analysis, moisture, heat stability, color, density, granulate physicals; new lots released only by test pressing; regrind stream passes its own contamination gate before joining the 80/20 mix | |
-| 6 | Pressing | Press telemetry logged every cycle; then per record: 100% inline optical inspection; sampled automated audio comparison against the source master | Artist/label approves the test pressing before the production run |
-| 7 | Finishing | Trimming quality; label print inspection (labels pre-dried in the oven); shrink wrap on sampling basis | |
+| L | Labels (parallel input) | Print inspection of each label lot against the approved proof; labels pre-dried in the oven before they go to the press (moisture in the paper causes bubbles); label lot logged per press cycle | |
+| 6 | Pressing | Bottom label, cake and top label are loaded between the stampers every cycle, so the labels are pressed into the record; press telemetry logged every cycle; then per record: 100% inline optical inspection (including label identity and centering); sampled automated audio comparison against the source master | Artist/label approves the test pressing before the production run |
+| 7 | Finishing | Trimming quality; inner sleeving; shrink wrap on sampling basis | |
 | 8 | Packaging | Incoming carton QC per delivery (dimensions, print Delta E against approved proof, seam strength, inner sleeve scuff check); assembly verification by scanning the runout matrix code against the jacket barcode; barcode verification on every unit | |
 | 9 | Fulfillment | Consignment assembly against the order's bill of materials; carrier tracking recorded per shipment or per dropshipped end customer | |
 
@@ -62,9 +64,9 @@ flowchart TD
   propagates through every metal generation and appears on every pressed
   record, which is what lets stage 9 verify that the right record is in the
   right jacket.
-- **Materials join the chain with their own gates**: PVC lots and regrind
-  batches enter at pressing, cartons and sleeves at packaging, and their lot
-  IDs attach to every record and order they touch.
+- **Materials join the chain with their own gates**: PVC lots, regrind
+  batches and label lots enter at pressing, cartons and sleeves at
+  packaging, and their lot IDs attach to every record and order they touch.
 - **A complaint resolves backwards**: any single record traces to its
   stamper, press, cycle, operator, compound lot, and packaging lot, and from
   the stamper back through mother and father to the lacquer and the approved