Spawn levels: every evolution stage that fits a zone spawns up to its top

Adrian (2026-10-31): Dusclops only spawned at Lv 45-46 in the Deep Dark,
because Cobblemon's own range for a stage stops where the next one takes
over. Every stage that reaches a zone's band now spawns up to the band's
top (Dusclops, Golbat, Doublade 45-60). Wild Pokemon never evolve; a
caught one past its evolution level evolves on its next level-up. Island
quick check passed (spawn survey and 36 self-tests).

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

tools/zone_spawns.py

@@ -20,8 +20,9 @@ datapacks/core/data/cobblesurvival/spawn_pool_world/<zone>.json:
   2. In its home zone a line keeps Cobblemon's spawn entries (bucket, weight, time, light,
      presets) for the biomes the zone has, plus "zone": "<id>". Levels are clamped into the
      zone's band, so the band picks the evolution stages: a stage whose levels miss the band
-     doesn't spawn there. If no stage fits, the closest one spawns across the whole band. The
-     line's top stage spawns up to the top of the band (Cobblemon's own ranges stop earlier).
+     doesn't spawn there. If no stage fits, the closest one spawns across the whole band. Every
+     stage that reaches the band spawns up to its top (Adrian, 2026-10-31; Cobblemon's own ranges
+     stop where the next stage takes over, which left e.g. Dusclops at Lv 45–46 in the Deep Dark).
   3. world/zones.json → "species" pins a line to a zone by hand: {"pikachu": "southwold"}.
   4. In cave zones every entry spawns in the cave's biome, and sky-light minimums, "can see sky", time
      of day, excluded biomes and the "natural" ground preset are dropped (there's no sky or day underground).
@@ -261,10 +262,9 @@ def main():
                   if (zid in cave_zones or b & biomes_of[zid]) and (high or m not in strong_flyers)]
         if not usable:
             continue
-        reaching = [u for u in usable if u[3][0] <= hi and u[3][1] >= lo]
-        top = max(reaching, key=lambda u: u[3][1])[2] if reaching else None
-        # The top stage spawns up to the band's top; Cobblemon's own ranges often stop well below it.
-        fitting = [(e, m, max(lv[0], lo), hi if m == top else min(lv[1], hi)) for e, b, m, lv in reaching]
+        # Every stage that reaches the band spawns up to its top; Cobblemon's own ranges stop where the next stage
+        # takes over. A caught one past its evolution level evolves on its next level-up.
+        fitting = [(e, m, max(lv[0], lo), hi) for e, b, m, lv in usable if lv[0] <= hi and lv[1] >= lo]
         if not fitting:
             # No stage reaches the band: the closest stage spawns across all of it.
             e, b, m, lv = min(usable, key=lambda u: min(abs(u[3][0] - hi), abs(u[3][1] - lo)))