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/quests.py

@@ -232,12 +232,12 @@ def chapter_quests(chapter, book, zones):
             q["tasks"] = [{k: v for k, v in t.items() if k != "each"} for t in tasks]
     # One quest per Sigil: craft it, use it, catch what comes (world/summons.json; names from the JEI data).
     if chapter.get("summons"):
-        sigils = json.loads((ROOT / "mod/src/main/resources/assets/cobblesurvival/jei/drop_sources.json").read_text())["summons"]
+        sigils = json.loads((ROOT / "datapacks/core/data/cobblesurvival/drop_sources/pages.json").read_text())["summons"]
         for s in sigils:
             quests.append({
                 "id": s["species"].split(":")[1], "title": s["name"], "icon": "cobblesurvival:summon_sigil", "after": ["about"],
                 "text": f"Craft the {s['name']} Sigil and use it in {zones[s['zone']]['name']}. Catch the Lv {s['level']} {s['name']} that answers.",
-                "tasks": [{"cobblemon": "catch", "pokemon": [s["species"]]}],
+                "tasks": [{"cobblemon": "catch", "pokemon": [s["pokemon"]]}],
             })
     # "Catch Pokémon of a zone": its spawn pool's species (Cobblemon Quests' own biome filter knows no zones).
     for q in quests: