Phase 5: breeding with Cobbreeding, Ditto a rare Deep Dark find

Adrian (2026-10-31): add Cobbreeding without a gate; only Ditto should
be rare, in an endgame area or gated behind something else.

- Cobbreeding 2.4.1 (Modrinth only) and Cloth Config (client) in the
  pack; Cobblebase's hatchery takes Cobbreeding's eggs.
- Ditto moved from Button Isle to the Deep Dark with both of Cobblemon's
  entries (rare in slime chunks, ultra-rare elsewhere): zone_spawns.py
  pins take {"zone", "all_entries"}; Deep Dark target +1, Button Isle -1
  so no other line moved; Southwold and Frostpeak guardians pinned (they
  tie on base stats and flipped between runs).
- HMs' Trainer Ditto is made uncatchable; it still trades.
- check_deps.py skips other-side dependencies; Cobbreeding's harmless
  client-mixin log line allowlisted.
- Self-tests cobbreeding_eggs_fit_the_hatchery, trainer_ditto_cant_be_caught;
  docs, balance table, Phase 5 checklist.

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

docs/zone-species.md

@@ -2,9 +2,9 @@
 
 Generated by `tools/zone_spawns.py` from Cobblemon's spawn data and `world/zones.json`; do not edit by hand. Each evolution line spawns in one zone; the stages listed are the ones whose levels reach the zone's band. Pin a line to another zone in `world/zones.json` → `species`.
 
-## Button Isle (Lv 2–10, 26 lines)
+## Button Isle (Lv 2–10, 25 lines)
 
-Bidoof, Bonsly, Caterpie (Butterfree, Caterpie, Metapod), Combee, Ditto, Gimmighoul, Hoothoot, Kricketot (Kricketot, Kricketune), Ledyba, Meditite, Meowth, Morpeko, Nincada, Pachirisu, Rattata, Sableye, Scatterbug (Scatterbug, Spewpa), Skitty, Smeargle, Spinarak, Sunkern, Tarountula, Weedle (Beedrill, Kakuna, Weedle), Wooper, Wurmple (Beautifly, Cascoon, Dustox, Silcoon, Wurmple), Wynaut
+Bidoof, Bonsly, Caterpie (Butterfree, Caterpie, Metapod), Combee, Gimmighoul, Hoothoot, Kricketot (Kricketot, Kricketune), Ledyba, Meditite, Meowth, Morpeko, Nincada, Pachirisu, Rattata, Sableye, Scatterbug (Scatterbug, Spewpa), Skitty, Smeargle, Spinarak, Sunkern, Tarountula, Weedle (Beedrill, Kakuna, Weedle), Wooper, Wurmple (Beautifly, Cascoon, Dustox, Silcoon, Wurmple), Wynaut
 
 ## Frostpeak Range (Lv 40–55, 43 lines)
 
@@ -50,9 +50,9 @@ Amaura, Anorith, Archen, Barboach, Carnivine, Cranidos, Cutiefly (Cutiefly, Ribo
 
 Bagon (Bagon, Shelgon), Baltoy (Baltoy, Claydol), Beldum (Beldum, Metang), Cleffa (Clefable, Clefairy, Cleffa), Comfey, Drowzee (Drowzee, Hypno), Druddigon, Elgyem, Espurr (Espurr, Meowstic), Fidough (Dachsbun, Fidough), Geodude (Geodude, Golem, Graveler), Indeedee, Klefki, Lunatone, Milcery (Alcremie, Milcery), Munna (Munna, Musharna), Orthworm, Sigilyph, Solosis (Duosion, Solosis), Solrock, Swirlix (Slurpuff, Swirlix)
 
-## Deep Dark (Lv 45–60, 21 lines)
+## Deep Dark (Lv 45–60, 22 lines)
 
-Bronzor (Bronzong), Carbink, Deino (Zweilous), Duskull (Dusclops, Dusknoir), Feebas (Milotic), Glimmet (Glimmora), Greavard (Houndstone), Honedge (Aegislash, Doublade), Klink (Klinklang), Maschiff (Mabosstiff), Mime Jr. (Mr. Mime, Mr. Rime), Mimikyu, Murkrow (Honchkrow), Nosepass (Probopass), Onix (Steelix), Ralts (Gallade, Gardevoir), Roggenrola (Gigalith), Rolycoly (Coalossal), Rookidee (Corviknight), Varoom (Revavroom), Zubat (Crobat, Golbat)
+Bronzor (Bronzong), Carbink, Deino (Zweilous), Ditto, Duskull (Dusclops, Dusknoir), Feebas (Milotic), Glimmet (Glimmora), Greavard (Houndstone), Honedge (Aegislash, Doublade), Klink (Klinklang), Maschiff (Mabosstiff), Mime Jr. (Mr. Mime, Mr. Rime), Mimikyu, Murkrow (Honchkrow), Nosepass (Probopass), Onix (Steelix), Ralts (Gallade, Gardevoir), Roggenrola (Gigalith), Rolycoly (Coalossal), Rookidee (Corviknight), Varoom (Revavroom), Zubat (Crobat, Golbat)
 
 ## Basalt Furnace (Lv 55–70, 16 lines)