Phase 3: strong flyers only spawn in high-level zones

- tools/zone_spawns.py: a species ridable through the air with top
  speed >= 60 or top stamina >= 85 never spawns in a zone whose band
  starts below Lv 30; lines that start as one are only placed in such
  zones, and the tool refuses to write pools that break the rule.
  Drampa moves to Sunscorch; Aerodactyl is fossil-only; Salamence never
  spawns wild (Bagon and Shelgon stay in the Dripstone caves).
- Ride stats stay Cobblemon's until play-tested (species_additions can
  override riding later).
- Phase 3 checklist: all steps in, approval checkpoint for Adrian.

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

docs/checklists/phase-3.md

@@ -23,7 +23,16 @@ Open `build/zone-map.png` (the island coloured by zone) and read the draft in `d
 
 - **Soft level pressure** (step 6). Pokémon far above a zone's band learn less there. Automated: `level_pressure_cuts_xp`.
 
-Still to come: flyers.
+- **Flyers** (step 7). Strong flyers only spawn in zones from Lv 30 up; checked by `tools/zone_spawns.py`. Ride stats are still Cobblemon's.
+
+All Phase 3 steps are in. Done-when from the roadmap: the spawn survey shows only each zone's species and levels (`spawn_survey`), and the cold zone hurts an unprotected player but not one in the fur set (`cold_needs_fur`).
+
+## Ask Adrian: approve Phase 3 before Phase 4
+
+- Zone species lists (`docs/zone-species.md`), guardians and their drops, level bands: placeholders to approve or change.
+- Hazard numbers: Frostpeak about 1 min bare / 14 min in fur at noon; Sunscorch about 2 / 25 min; the Mire's Poison every 5 s without waders.
+- Level pressure: 10 % less experience per level beyond 5 above the band, at least 10 %.
+- Flyers: ride stats unchanged until play-tested; Salamence never wild, Aerodactyl fossil-only.
 
 ## In-game
 
@@ -36,3 +45,4 @@ Still to come: flyers.
 - [ ] **Guardians:** `/cobblesurvival guardians` (operator) lists each zone's guardian and spot. Walk there: a big Pokémon appears, can't be caught, and beating it puts its drops in your inventory with a gold message. It's gone for 5 hours of play.
 - [ ] **Mire:** walk into the Mangrove Mire: a green warning, then Poison keeps coming back. With Mire Waders on (from the Westmarch or Jungle guardian) nothing happens.
 - [ ] **Level pressure:** bring a Lv 30 Pokémon to Button Isle and win a battle: it gains only a sliver of experience, while a Lv 10 one gains the full amount.
+- [ ] **Flyers:** no Pokémon you can fly on turns up wild before Sunscorch or Frostpeak; mounting any flyer you own still works everywhere.