Add the Payap University partnership: joint student programmes

Payap also wants to work closely with the project on new student
programmes: audio engineering (mastering, lathe cutting), IT, business
administration and more.

New docs/payap-partnership.md: why it fits (mastering/cutting engineers
are the hardest hires; Payap has music, IT, business, communication arts,
an English-language International College and pharmacy labs; the plant has
a lathe, production data and a real factory application), programme areas
mapped to the docs they draw on, and what it changes: a reason to bring
the cutting room (roadmap item 27) forward, a cutting engineer before the
students, lacquer and stylus cost of teaching, pre-release security for
customer audio, student access and safety, IT work on staging only, the
link to the Payap land, BOI R&D merit. Suggested form: MOU, internships,
short certificate courses first, degree tracks later; what to settle in
writing and questions for the next meeting.

Links from README (bullet, layout), site-candidates, roadmap item 27, the
supplier map's open training item and the BOI open items.

README.md

@@ -144,6 +144,10 @@ The detail lives in dedicated documents:
   side (the Mueang Chi lease, the Northern Region Industrial Estate, and
   Payap University's offer of land next to a pharmaceutical facility under
   construction) and what has to be checked before any of them is chosen
+- [Payap University partnership](docs/payap-partnership.md): joint student
+  programmes in audio engineering (mastering, lathe cutting), IT and
+  business built around the plant, what they change in the plan (cutting
+  room earlier, pre-release security, student access) and what to agree
 - [Project scale](docs/scale.md): rough numbers for everything on one page:
   output capacity, building area, land, electrical demand, solar and
   storage, steam and fuel, headcount, and money cross-references
@@ -189,6 +193,7 @@ docs/
 ├── crane-workshop-tours.md Overhead crane, workshop, visitor corridor
 ├── digital-factory.md     Data platform, NixOS/Clan fleet, acquisition, app
 ├── facility-security.md   Security, HVAC, fire and life safety, compliance
+├── payap-partnership.md   Joint student programmes with Payap University
 ├── plant-operation.html   Animated plant overview (simulated SCADA)
 ├── process-flow.md        Audio file to delivered record, with all checks
 ├── production-timeline.md Order turnaround, stage by stage