Classes become trades; building costs draw on every trade

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -10,7 +10,8 @@ Alpha. One season, bandit raids plus two friendly events, six buildings.
 ## What's in it
 
 - **Skills:** mining, woodcutting, farming, hunting, fishing, smithing,
-  masonry, cooking, leatherworking, combat, plus the scout's reconnaissance.
+  masonry, construction, cooking, leatherworking, herblore, combat, prayer and
+  reconnaissance.
 - **Combat:** fights cost HP (less when out-levelled or armoured); below half
   health you eat food from your bank, and out of food you retreat, losing
   nothing but the fight. HP recovers 25% an hour.
@@ -21,8 +22,14 @@ Alpha. One season, bandit raids plus two friendly events, six buildings.
   five tools; every leather tier a cap, trousers and jerkin. Higher bars need
   coal; each metal past copper needs a Smithy level (rune needs level 5, so a
   city). Gear needs a combat level to wear, tools a skill level to use.
-- **Classes:** warrior, scout, artisan, pioneer. Every class can train every
-  skill; a class makes some skills 20% faster and has one signature ability.
+- **Classes are trades,** from gathering to finished goods, so each player has
+  a quiet gathering side and a busier crafting side: miner (mining, smithing),
+  builder (woodcutting, construction, masonry), homesteader (farming, cooking,
+  herblore) and ranger (hunting, fishing, leatherworking, cooking). A trade's
+  skills are 20% faster, 1 in 10 of its crafts make double, and each has one
+  bonus of its own. Every class can train every skill, scout and drill.
+  Building costs draw on all four trades: thatch, flax for rope, hide glue,
+  leather and provisions as well as wood, stone and metal.
 - **Bank:** 12 slots of 1,000 each to start; more than a stack of one item
   spills into another slot. When something doesn't fit it goes to the city
   stockpile (or the action stops, if you prefer).