Optical QC: one station for both presses, after the cooling racks

User, 18 Oct 2026: for now one QC station for both machines; let the
records cool in a queue before testing them.

- inline-optical-qc.md "Where it sits": launch setup. Spindle stacks
  from the Duplex system and the Classic, labelled at the press (press,
  stamper set, first and last cycle), cool in FIFO racks (24 h accepted
  practice, 8 h at the shortest, Stamper Discs; about one day of output,
  2,800 to 3,100 records); the finishing operator feeds the station from
  the cooled stacks. Gains: warp and centring measured on settled records
  (the release value), one station instead of two, no Classic unloader
  change, no warm-record sag or thermal camera. Cost: defects found hours
  later, covered by the Duplex operator, per-cycle telemetry and an early
  lane for the first records of each run and after stamper changes.
  Record key from the stack label and stack position, checked against the
  run-out stamper number. Capacity 10 to 12 a minute against 5 to 6:
  one station to about two Duplex systems and two Classics. A station at
  each press stays the later option. Cost table, open points, infeed row,
  thermal camera note and the Newbilt question follow.
- Fleet calculator: the per-press stations and the release station are
  gone; the finishing block shows the cooling racks with record stacks
  and the one optical station by the corridor glass; tooltips, corridor
  and conveyor texts; machine park back to its legend, finishing box
  "cooling, QC, packing".
- quality-automation.md layer 1, digital-factory.md QC row,
  process-flow.md stage 6, site-candidates.md block ground floor,
  crane-workshop-tours.md tour stop 6.
- Investor render: infeed label "the operator sets each cooled record
  down".

Checks: node --check; pw_bp_calc.py 0 fails; pw_iso_view_check.py OK;
info for every data-id at all presets, levels and rotations; GF nodes
2,414 at the full preset; zoomed shots in two rotations.

docs/crane-workshop-tours.md

@@ -290,9 +290,8 @@ to run along the corridor:
 3. Stamper prep
 4. Material lab and PVC handling
 5. **Press hall**, the long glazed stretch and the centre of the tour
-6. Release inspection of cooled samples (every record is already
-   checked by the optical QC station at its press, and the presses trim
-   inline)
+6. Cooling racks and 100% optical inspection of the cooled records (the
+   presses trim inline)
 7. QC and listening, with a headphone listening point
 8. Finishing and packaging, where the records leave production