Plan: P4/P5 decisions (lightning hits trees only, server-set rot speed, Old Stag in, antler pickaxe stats)

docs/PROGRESSION_DESIGN.md

@@ -208,14 +208,16 @@ so on a server everyone faces the same bear and the same alpha.
 - **Food spoilage**: raw meat and fish rot after 2 in-game days (berries
   3, mushrooms 4). A **smoking rack** (wood, fibre) and **salt** (from the
   sea-cliff rocks) preserve them. Cooked food keeps longer. Makes storing
-  food a choice, and feeds the bear/crow raids.
+  food a choice, and feeds the bear/crow raids. *Decided: a server (and a
+  new single-player world) can set slower rot*, like the difficulty rules.
 - **Food poisoning**: raw meat sometimes makes you sick (stamina regen
   halved, can't eat for a minute). Cooking fixes it.
 - **Blizzards**: on cold days a blizzard can roll in: visibility drops,
   warmth falls fast outside, snow piles on roofs. Being sheltered matters.
 - **Lightning**: in storms, lightning can strike tall things near the rim;
-  a struck tree or **wooden** piece catches fire and burns for a while
-  (stone doesn't). Optional (§8), as losing a base to weather can feel unfair.
+  a struck tree catches fire and burns for a while. *Decided: trees only,
+  for now* (buildings are never struck; losing a base to weather can feel
+  unfair). Wooden pieces burning may come later as a server rule.
 - **Hard winters**: every ~12 days, three cold days in a row (snow down to
   the valley, the lake edge freezes, fewer animals). A seasonal goal: stock
   food and fuel before it.
@@ -224,8 +226,10 @@ so on a server everyone faces the same bear and the same alpha.
 Three **barrow key pieces** (from barrow chests) open the **standing
 stones** on the rim. At night they summon the **Old Stag**, a huge antlered
 spirit: charges, summons a wolf pack, has phases. Beating it drops its
-antler: **antler pickaxe** (mines anything, even granite, fast) and a
-trophy. The world remembers it was beaten (a message on a server).
+antler: the **antler pickaxe** and a trophy. The world remembers it was
+beaten (a message on a server). *Decided: the boss is in.* The antler
+pickaxe mines faster than iron, lasts a little longer and costs less
+stamina a swing (no granite: P2 didn't add it).
 
 It's a milestone, not a gate: nothing is locked behind it except bragging
 rights and the best pickaxe. More bosses can come with new worldlets.
@@ -245,14 +249,14 @@ P3 and P5 are creatures, so they should come **after M2.5**, built directly
 on the server-side creature code instead of being written twice. P4 can come
 any time; spoilage on a server runs with the shared clock.
 
-## 8. Questions for you
-1. **Durability:** tools wear out and need repairing (recommended: it's
-   what makes iron matter), or tools last forever?
-2. **Lightning and fire:** can storms set wooden buildings alight, or keep
-   weather from destroying bases?
-3. **Raids:** should adversaries damage buildings (the alpha breaking wooden
-   doors, the bear raiding chests), or only threaten the player?
-4. **The boss:** worth having (the Old Stag), or keep it to the wild
-   island with no boss fights?
-5. **Order:** P1 iron + P2 stone now, then M2.5, then the creatures? Or
-   M2.5 first?
+## 8. Decisions
+1. **Durability:** tools wear out and are repaired (built in P1).
+2. **Lightning and fire:** lightning strikes trees only, for now; it never
+   sets buildings alight.
+3. **Raids:** adversaries can damage and raid (the alpha breaks wooden
+   doors, the bear empties food chests; built in P3).
+4. **The boss:** yes, the Old Stag (P5).
+5. **Order:** P1, P2, M2.5, P3 done; P4 next, then P5.
+6. **Spoilage:** a server (or a new world) can set slower rot.
+7. **Antler pickaxe:** mines faster than iron, lasts a little longer, less
+   stamina a swing.