Shareholding: main investor holds at least 60 %, 40 % for sale

User, 20 Oct 2026: the main investor W wants to hold at least 60 % of
the company (the BOI-promoted company), so only 40 % is for sale.

- total-investment.md "Two plans": the 60/40 rule; Ploy Printing's
  stake, founders' shares and any further co-investor come out of the
  40 %; at Plan B's ~54M THB equity floor (3:1) and one share price
  that is at least ~32M / at most ~22M THB (arithmetic only; share
  price, valuation and in-kind shares not agreed).
- README Project Status and boi.md (foreign-ownership privilege) point
  to it.
- Business plan: section 12.2 states the split (A: ~28M / ~18M, B:
  ~32M / ~22M at the equity floor, arithmetic), the co-investment bullet
  and the decisions list name the 40 %; A and B rebuilt (63 pages each,
  TOC and em-dash check clean).

README.md

@@ -79,7 +79,11 @@ steps are open planning items.
   **Plan A, ~182M THB** (~2M above 180M since steam went biomass), the
   launch plant with six cost levers, and **Plan B, ~217M THB**, the same
   launch plant with everything in. **The main investor wants to go with
-  Plan B** (19 October 2026); the investor deck leads with it.
+  Plan B** (19 October 2026); the investor deck leads with it. The main
+  investor holds **at least 60 % of the company**, so at most 40 % is for
+  sale to co-investors (Ploy Printing, the founders, others;
+  [shareholding](docs/finance/total-investment.md#two-plans-a-at-180m-thb-and-b-at-215m-thb-october-2026),
+  20 October 2026).
   Chinese boilers, compressor and hydraulics save about 2M THB of that
   ([Chinese suppliers](docs/suppliers/china-utilities.md)).
   The business plan is re-based on it (draft 0.2).