Wolves with a den, fishing, and a mixed diet

Wolves
- Den: a boulder cave at the foot of the rim, sited from the seed (away
  from the sea and spawn, mouth toward the valley, clearing in front)
- Grace period: no wolves days 1-2; they move in on day 3 and howl; hunting
  from night 4; pack of 2, 3 from day 6, 4 from day 9; replaced by day
- Wary pack hunters: circle and dart in one at a time; a lit campfire is a
  safe zone, a torch makes them hesitate, walls block bites (line of
  sight); hit one and the pack turns; hurt wolves flee; a lone wolf is
  timid; by day they defend the den; home at dawn
- Glowing eyes, synthesised howls, can't sleep with wolves prowling
- Wolf pelt and Wolf Cloak (+25 warmth)
- Animals take a committed detour around obstacles

Fishing
- Fishing rod (workbench); cast a float onto the lake, 1.5 s to land a bite
- Perch and rarer trout; faster bites at dawn/dusk and in rain; grill them
- Visible fish near the shore that jump with splash rings

Mixed diet
- Foods belong to meat, fish or greens; each level runs down over ~1.5 days
- One group low: no healing; two low: Malnourished (health drains);
  all three good: Balanced diet (heal x1.5); HUD diet bars; saved

Tests: test_wolves and test_fishing_diet; run_all.sh covers 9 suites

docs/ROADMAP.md

@@ -33,7 +33,9 @@ Detailed plan in `docs/SURVIVAL_DESIGN.md` (phases M1a–M1d).
 - [x] Snap-together building: floor/wall/door/roof/gable, resource cost, support + collapse, dismantling *(M1c)*
 - [x] Bed spawn point and sleeping, resource regrowth *(M1c)*
 - [x] Creatures (rabbit, deer, boar), hunting, club/spear/bow, butchering, cooked-food buffs, hide cloak *(M1d)*
-- [ ] Wolves at night, hide armour, more recipes *(later M1 polish)*
+- [x] Wolves at night with a den and a 3-day grace period, wolf cloak *(M1e)*
+- [x] Fishing (rod, perch and trout, grilling) and a mixed diet *(M1e)*
+- [ ] Hide armour, more recipes, sea fishing *(later M1 polish)*
 - **Done when:** gather → craft → build a tiny shelter, single-player.
 
 ## M2 — Multiplayer · ~2–4 months

docs/SETUP_ON_NEW_MACHINE.md

@@ -20,6 +20,10 @@ tests/run_all.sh
 ```
 Or one at a time:
 ```bash
+# Wolves: den, grace period, hunting, fire and walls, pack tactics
+godot --headless --path . --script res://tests/test_wolves.gd
+# Fishing and the mixed diet
+godot --headless --path . --script res://tests/test_fishing_diet.gd
 # Wildlife, melee, spear, bow, butchering, cooking + buffs, cloak, drops
 godot --headless --path . --script res://tests/test_creatures_combat.gd
 # Weather, shelter, snap building, support, doors, beds, regrowth

docs/SURVIVAL_DESIGN.md

@@ -159,7 +159,8 @@ Built in M1b (`scripts/player/survival.gd`), current numbers:
 | Deer | 40 | 9 m/s | 16 m (30 m if you sprint) | flees, outruns you | 2-3 meat, 1-2 hide |
 | Boar | 60 | 6.6 m/s | never | neutral; hit it and it charges and gores you for 14 every 1.6 s for 18 s, and flees below 30% HP | 3-4 meat, 1-2 hide |
 
-- *(later)* **Wolf**: night predator, hunts in packs.
+- **Wolf** *(built)*: 45 HP, 8.6 m/s, bites for 9 (every 1.2 s at most).
+  Butchering gives 1-2 meat and a wolf pelt. See 2.8a.
 - `scripts/creatures/creature.gd` runs each animal's state machine (idle,
   wander, flee, charge, dead). Steering is over the heightmap with no navmesh:
   a probe ahead turns the animal away from water, steep drops, the world edge
@@ -174,6 +175,65 @@ Built in M1b (`scripts/player/survival.gd`), current numbers:
   arrows stuck in it come back to you. Carcasses rot away after 5 min.
 - Feathers lie in the meadows as ground pickups (70, regrowing like sticks).
 
+### 2.8a Wolves and the den *(built)*
+- **The den** (`den.gd`): a cave of piled boulders at the foot of the
+  mountain rim, chosen from the seed. It sits away from the sea and the
+  spawn, opens toward the valley, and has a clearing in front of its mouth.
+  It has a rock roof (it counts as shelter) and old bones on the floor.
+- **Grace period** (`wolf_pack.gd`):
+  - Days 1-2: no wolves at all.
+  - Day 3: wolves move into the den and howl at night, with a toast
+    warning. They don't hunt yet.
+  - Night 4 onward: the pack hunts (night is 19:30 to 05:30, the same as
+    the bed). Pack size is 2, then 3 from day 6 and 4 from day 9. Wolves
+    you kill are replaced at the den by day, while you're away from it.
+- **Temperament: wary pack hunters**, neither berserkers nor harmless:
+  - The pack circles you about 10 m out, and one wolf at a time darts in to
+    bite, every 4.5 s or so.
+  - A **lit campfire** within 8 m is a safe zone: they circle 14 m out
+    around the fire and never close in.
+  - A **held torch** makes them hesitate (2.5x longer between darts).
+  - **Walls work**: a bite needs a clear line from the wolf to you, so a
+    closed hut is safe. You also can't sleep while wolves prowl within 40 m.
+  - Hit one and the whole pack turns on you. Below 40% HP a wolf runs off
+    for the night.
+  - The **last wolf** of a pack is timid: it keeps its distance, backs off,
+    and won't start a fight.
+  - **By day** they rest in the den but defend it. Within 14 m they get up
+    and watch you; within 8 m (or if you hit one) they attack.
+  - At dawn they go home. Once out of your sight they slip straight back.
+- Wolves glow-eyed at night (emissive eyes). Howls are synthesised.
+- Animals now take a short committed detour when blocked, so they slide
+  round huts and rocks instead of turning back into them.
+- **Wolf Cloak** (3 wolf pelt + 2 hide + 4 fiber, workbench): +25 warmth,
+  wet chill x0.35.
+
+### 2.8b Fishing *(built)*
+- **Fishing Rod** (2 sticks, 3 fiber, 1 flint at a workbench). LMB casts
+  the float in a lobbed arc. It has to land on lake water at least 0.5 m
+  deep: on land you're told so and nothing bites.
+- A bite comes after 5-14 s, sooner at dawn and dusk (x0.6) and in the rain
+  (x0.8). The float bobs and dips; you have **1.5 s** to click and land the
+  fish, or it gets away and you wait again. Clicking with nothing biting
+  just reels in. Walking more than about 30 m off snaps the line, and
+  switching away from the rod reels in.
+- Catch: perch (common) and trout (22%, or 40% at dawn and dusk). Grill
+  them at a campfire. A few fish swim visibly in the lake.
+
+### 2.8c Mixed diet *(built)*
+Every food belongs to a group: **meat** (raw meat 8, cooked 40), **fish**
+(raw 8-12, grilled perch 30, grilled trout 45) or **greens** (berries 14,
+mushroom 10, roasted mushroom 30). Each group has a level (0-100, starting
+at 60) that runs down over about 1.5 days (1800 s). The HUD shows three
+small Diet bars, and a low group blinks.
+- **One group under 15**: Poor diet (need fish). No natural healing.
+- **Two or more under 15**: Malnourished. Health drains 0.12/s and stamina
+  recovers at 70%. Living on berries alone keeps you full but kills you in
+  about a day and a half.
+- **All three at 40 or more**: Balanced diet, healing x1.5.
+- Diet is saved. After death each group is at least 30, so you don't
+  respawn straight into malnutrition.
+
 ### 2.9 Weapons & combat *(built in M1d)*
 | Weapon | Recipe | Use | Damage |
 |---|---|---|---|