Phase 9: reproducible builds, balance from the server, spark check, play feedback

Build: every tool pinned (JDK, packwiz, Gradle plugins, Python packages), exports
normalised, tools/check_reproducible.py proves two clean builds are byte-identical.

Server-side balance: a server can load config/cobblesurvival/datapack.zip in place of
the jar's data, /reload applies it, tools/server_update.py packages it and refuses
when a client change is needed. JEI drop pages are sent by the server. Code-held
balance numbers moved to tuning/server.json.

Performance: spark in the pack (server only), tools/perf_test.py with fake players
whose chunks really are active, docs/performance.md.

Adrian's feedback: default keys R, U, J, §; drop pages link to Cobblemon Info and show
real chances; bosses only hurt in battles; battle XP halved; channels between the
islands low level; temperature ×3 with insulation doubled; hazards start at once; no
item dots on the map; a wild attack starts a battle; the starter only faints; quest
book on join with a basics page and an HMs page; regional forms obtainable.

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

tools/zone_bosses.py

@@ -7,7 +7,6 @@ datapacks/core/data/cobblesurvival/bosses/<zone>.json, and bosses/end.json for t
 guardian's level (TIERS): which patterns it uses, how long they telegraph, how often they come; damage grows with
 level; a Fire, Ice or Poison guardian burns, freezes or poisons. Placeholder numbers, see docs/balance.md.
 
-Needs the Cobblemon jar in build/server/mods (any test-server run) for the guardians' types.
 
 Usage: tools/zone_bosses.py
 """
@@ -15,10 +14,11 @@ import json
 import zipfile
 from pathlib import Path
 
+import lock
+
 ROOT = Path(__file__).resolve().parent.parent
 DATA = ROOT / "datapacks/core/data/cobblesurvival"
 OUT = DATA / "bosses"
-MODS = ROOT / "build/server/mods"
 
 ARENA = 24
 ARENA_BY_ZONE = {"basalt": 32}
@@ -79,8 +79,7 @@ def species_data(jar):
 
 
 def main():
-    jar = next(MODS.glob("Cobblemon-*.jar"))
-    types, heights = species_data(jar)
+    types, heights = species_data(lock.mod_jar("cobblemon"))
     OUT.mkdir(parents=True, exist_ok=True)
     for old in OUT.glob("*.json"):
         old.unlink()
@@ -99,7 +98,7 @@ def main():
     print(f"end: {END['species']} Lv {END['level']}, {len(end['patterns'])} patterns")
     table = json.loads((ROOT / "world/summons.json").read_text())
     for species, s in table["summons"].items():
-        fight = boss(table["tiers"][str(s["tier"])]["level"], types.get(species, set()), SUMMON_ARENA, summon=species)
+        fight = boss(table["tiers"][str(s["tier"])]["level"], types.get(s.get("species", species), set()), SUMMON_ARENA, summon=species)
         (OUT / f"summon_{species}.json").write_text(json.dumps({"_comment": comment, **fight}, indent=1) + "\n")
     print(f"{len(table['summons'])} summoned legendaries")