Inline QC station: real 40x40 profiles, labelled investor render

User, 18 Oct 2026: use real 40x40 profiles, make a render with text
pointing out the parts to show the investor; the ring lights looked
like they were floating.

- build_station.py: frame drawn from the real 8-slot 40 series section
  (profile_shape: slots, centre bore, corner cavities; 40x80 with centre
  cavity) and 24 cast angle brackets; top beams now butt between the
  uprights; label-camera posts moved beside the cameras so both ring
  lights clamp straight to them; top line-scan on a side post with
  visible camera plate and light hangers; slide strips on carrier angles,
  pulley axles, end-stop posts, presence-sensor brackets, backlight post,
  cabinet on base crosses, chute on two supports and clear of the rail,
  pneumatics rail, stack light on the back upright, touch screen on the
  front end upright. A connectivity check at the end lists any part that
  does not reach the floor through touching parts: none.
- render_annotated.py (FreeCAD): front three-quarter view, camera backed
  off so nothing is clipped, no navigation cube or preselection, label
  positions projected from the camera and checked with marker renders.
- annotate_render.py (Pillow): title, 16 labels in two columns, leaders
  assigned so none cross -> inline-qc-station-annotated.png.
- render_station.py: same camera and preselection fixes; all six views
  re-rendered.
- BOM: 32 m of 40x40 in 45 pieces; total still USD 16k to 33k.
- inline-optical-qc.md and README updated; .gitignore for the render
  intermediates.

README.md

@@ -348,7 +348,8 @@ docs/
 │   ├── galvanics.md       Electroforming and stamper prep equipment plan
 │   ├── inline-optical-qc.md  Devices for the record inspection station
 │   ├── inline-qc-station/    Concept model of the station (FreeCAD script,
-│   │                         .FCStd, renders, bill of materials)
+│   │                         .FCStd, renders, labelled investor view,
+│   │                         bill of materials)
 │   └── pressing-line.md   Press fleet strategy and equipment plan
 ├── finance/               Project cost overviews, revenue model,
 │                          construction RFQ, PEA electricity tariff