Unified Engelbert Strauss workwear for all staff

User, October 2026: we want unified Engelbert Strauss work clothes.

- worker-safety.md: decision recorded; everyone, office included, in the
  same Strauss workwear with the company logo, process PPE on top. Kit at
  Strauss catalogue prices checked October 2026 (incl. 19 % German VAT,
  which drops out on export): production 3 trousers e.s.motion 2020, 3
  polo shirts, 2 T-shirts, a sweatshirt, S1 safety shoes e.s. Vasegus II
  low, ~293 EUR before VAT, ~338 with embroidered logos (embroidery price
  an estimate); office 4 polos and a softshell jacket, ~127 EUR. Ordering:
  Strauss ships outside Germany where customs law allows, shipping quoted
  with the order, prepayment, duty and taxes charged to the recipient;
  Thai duty on work trousers 13.8 %, BOI does not cover clothing. About
  9k USD (~0.3M THB) a year at the start fleet. Check lighter lines for
  the press hall heat with samples.
- revenue-model.md: workwear noted on top of the x1.3.
- Fleet calculator: workwear line under labour (production and office
  kits a year, shipping and Thai duty), six new assumptions; 8,573 USD a
  year at the defaults.

docs/finance/revenue-model.md

@@ -519,6 +519,8 @@ plus the occupational checks the law requires for risk-factor work (see
 planning prices, ~20 people at the start fleet, so ~0.35M THB a year. The
 ×1.3 itself is roughly the employer's social security (5 % up to a 17,500
 THB ceiling since January 2026) plus ~25 % for overtime, bonus and PPE.
+Unified Engelbert Strauss workwear for all staff adds ~0.3M THB a year
+(kit, prices and import in [worker safety](../worker-safety.md)).
 The [press fleet calculator](../fleet-calculator.html) costs labour from
 base salaries in that way.