Add biomass fuel strategy: 60 rai coppice idea and northern fuel market

Own land yields ~80-135 t/yr vs ~350-400 t/yr mature demand; forestry
classification check gates everything; staged electric-first path with
coppice planted now for the expansion-phase biomass boiler

README.md

@@ -67,6 +67,10 @@ The detail lives in dedicated documents:
   commitment, and the materials strategy
 - [Worker safety](docs/worker-safety.md): safety training, galvanics clean
   rooms and decontamination, PPE
+- [Biomass fuel strategy](docs/biomass.md): the 60 rai own-grown coppice
+  idea (with the forestry-classification check that comes first), northern
+  agricultural waste as the main supply, and the staged electric-to-biomass
+  path
 - [BOI investment promotion](docs/boi.md): the promotion strategy (Group B
   base activity plus solar, automation, and R&D measures for the tax value),
   requirements, Northern-region angle, and why BOI approval precedes
@@ -97,6 +101,7 @@ docs/
 │   └── pressing-line.md   Press fleet strategy and equipment plan
 ├── finance/               Project cost overviews
 ├── suppliers/             Supplier contacts, vendor landscape, supplier map
+├── biomass.md             Biomass fuel strategy and the 60 rai coppice idea
 ├── boi.md                 BOI promotion strategy and requirements
 ├── facility-security.md   Security, HVAC, fire and life safety, compliance
 ├── process-flow.md        Audio file to delivered record, with all checks