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>

pack/config/defaultoptions/keybindings.txt

@@ -1,15 +1,18 @@
 key_key.cobblemon.summary:key.keyboard.n
 key_key.cobblemon.hideparty:key.keyboard.y
-key_gui.xaero_waypoints_key:key.keyboard.j
+key_gui.xaero_open_map:key.keyboard.j
+key_gui.xaero_waypoints_key:key.keyboard.unknown
 key_gui.xaero_minimap_settings:key.keyboard.unknown
 key_key.jade.show_details:key.keyboard.v
-key_key.jei.showRecipe:key.keyboard.g
+key_key.jei.showRecipe:key.keyboard.r
+key_key.jei.showUses:key.keyboard.u
 key_key.jei.bookmark:key.keyboard.k
 key_key.jei.focusSearch:key.keyboard.h:CONTROL
 key_key.jei.pauseRecipeCycling:key.keyboard.right.control
 key_key.jei.nextSearch:key.keyboard.unknown
 key_key.jei.previousSearch:key.keyboard.unknown
 key_key.kubejs.kubedex:key.keyboard.unknown
+key_key.ftbquests.quests:key.keyboard.grave.accent
 key_key.ftbquests.gui.recenter:key.keyboard.home
 key_key.ftbquests.gui.next_chapter:key.keyboard.period
 key_key.ftbquests.gui.prev_chapter:key.keyboard.comma