P5 the Old Stag: standing stones and altar, three-phase boss with charges, stun window, spirit wolves and stomps; antler pickaxe and trophy; group scaling and credit for every fighter; online 3-player test (protocol 12)

docs/ROADMAP.md

@@ -43,6 +43,7 @@ Detailed plan in `docs/SURVIVAL_DESIGN.md` (phases M1a–M1d).
 - [x] The bear: raids unattended food, palisades and closed huts keep it out, bear hide rug, bear fat *(P3, part 2)*
 - [x] Crows and foxes steal food left out; the barrow, its guards, the coffin and key pieces *(P3, part 3)*
 - [x] Hazards: food spoilage (rot speed setting), smoking rack and salt, food poisoning, harsher blizzards, hard winters, lightning on trees *(P4)*
+- [x] The standing stones and the Old Stag: a three-phase boss, its antler and trophy, the antler pickaxe *(P5)*
 - [ ] **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