Share price for the 40 %: market-based ranges, deck slide 13

User, 20 Oct 2026: add a page about possible share prices, do some
calculation on normal market data.

- docs/finance/share-price.md (new): market data with sources and
  dates (Damodaran January 2026 EV/EBITDA, P/E and betas for emerging
  markets and global; Thailand ERP 6.18 % (July 2026); ThaiBMA 10-year
  2.30 % (19 Oct 2026); illiquidity discount 20 to 35 %; venture target
  returns by stage; SET peers SCGP, TPAC, SITHAI, GRAMMY; Thai Civil and
  Commercial Code on par value and premiums).
- Results, all estimates: A founding round at par, pari passu: 542,500
  shares of 100 THB at Plan B's 54.25M equity floor, the 40 % ~21.7M
  THB; B a premium only for documented pre-round costs (102 to 137 THB);
  C value per share once running at ~163M THB debt: adverse ~0, central
  126 to 1,016 THB, favourable 508 to 2,512 THB; D a financial investor
  today 18 to 236 THB (central); E calculator cross-check. Recommendation:
  par for the founding round; pre-emption and information rights for the
  40 %.
- Deck: new slide 13 "Share price: what the 40 % could cost" in both
  themes, with notes; the ask slide points to it; 17 slides, both PDFs
  rebuilt; site slide notes trimmed.
- README bullet, layout line and Project Status link; total-investment
  shareholding paragraph links the page.

docs/finance/total-investment.md

@@ -150,7 +150,8 @@ of it were paid in at one share price, the main investor's 60 % would be
 at least ~32M THB and the 40 % at most ~22M THB (arithmetic only: the
 share price, the valuation, the total equity above the floor and any
 founders' or in-kind shares are not agreed). The terms go into the
-shareholders' agreement (business plan section 12.2).
+shareholders' agreement (business plan section 12.2). Possible share
+prices for the 40 % from market data: [share price](share-price.md).
 
 Decided (user, October 2026): the business plan comes in **two
 versions** for the investor, built from the same documents: