P2 stone: stonecutter, cut stone, stone floors/walls/pillars/stairs/windows/doorway, hearth; wooden stairs, windows, posts, palisade and gate; stone support rules

docs/PROGRESSION_DESIGN.md

@@ -1,6 +1,6 @@
 # Progression and challenges design
 
-Status: **P1 (iron) built**; P2-P5 are proposals.
+Status: **P1 (iron) and P2 (stone) built**; P3-P5 are proposals.
 
 *As built in P1:*
 - Iron nuggets (70, in the scree under the rim), clay (60, on the lake
@@ -20,6 +20,23 @@ Status: **P1 (iron) built**; P2-P5 are proposals.
 - Not yet: the cooking pot and stews, the iron-banded door (with P3, when
   something can break doors), iron armour.
 
+*As built in P2:*
+- Stonecutter (workbench: 8 wood, 4 iron, 10 stone) cuts 2 stone into a
+  block of cut stone. No granite outcrops yet: the stonecutter is the only
+  source.
+- At the stonecutter: stone floor (4), wall (6), pillar (3), stairs (4),
+  window (5), doorway with a wooden door (6 + 4 wood), hearth (10).
+- At the workbench: wooden stairs, window and palisade (with nails), a
+  wooden post, a palisade gate.
+- Support: stone loses 5% going up (wood 10%); wood can't hold stone up
+  ("Stone needs stone or the ground under it"); through a pillar any step
+  up or down counts as vertical, so a post under a span carries it.
+- Hearth: a campfire (fuel, cooking, wolves) with 1.5x the heat radius that
+  rain never speeds up. A sheltered room with mostly stone walls is 6
+  warmer. Shelter rays now run 0.6 m up, under window sills, so a room with
+  windows still counts.
+- Palisade: 3 m tall, blocks like a wall online too. No fences.
+
 Today the island runs out of goals after a few days: once you have stone
 tools, a hut, a bow and a fire, the only threats are wolves at night, the
 cold and your diet. This plan adds a **second tier of materials** (iron and

docs/ROADMAP.md

@@ -38,6 +38,7 @@ Detailed plan in `docs/SURVIVAL_DESIGN.md` (phases M1a–M1d).
 - [ ] Hide armour, more recipes, sea fishing *(later M1 polish)*
 - [x] Wild flax (fibre plants) *(polish)*
 - [x] Iron: nuggets, ore, clay, kiln, smelter, forge, iron tools and arrows, lantern, tool wear and repair *(P1)*
+- [x] Stone building: stonecutter, cut stone, stone floors, walls, pillars, stairs, windows, doorways, hearth; wooden stairs, windows, posts, palisade and gate *(P2)*
 - [ ] **Iron, stone building and new adversaries**: iron nuggets and ore,
       smelting and a forge, iron tools and durability, cut-stone building,
       an alpha wolf, a bear, a barrow with guards, spoilage and blizzards