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/ftbquests/quests/chapters/legends.snbt

@@ -7,7 +7,7 @@
 		id: "cobblesurvival:summon_sigil"
 	}
 	id: "0217ED8D82F11BE4"
-	order_index: 16
+	order_index: 17
 	quest_links: [ ]
 	quests: [
 		{
@@ -729,5 +729,101 @@
 			x: 6.5d
 			y: 4.5d
 		}
+		{
+			dependencies: ["73A150C1A7221BD0"]
+			icon: {
+				id: "cobblesurvival:summon_sigil"
+			}
+			id: "027E3B8E614FA133"
+			tasks: [
+				{
+					action: "catch"
+					amount: 1L
+					biome: ""
+					dex_progress: ""
+					dimension: ""
+					form: ""
+					gender: ""
+					id: "2424A0A7C316243A"
+					max_level: 0
+					min_level: 0
+					natures: ""
+					poke_ball_used: ""
+					pokemon: "cobblemon:zapdos"
+					pokemon_type: ""
+					region: ""
+					shiny: false
+					time_max: 0L
+					time_min: 0L
+					type: "cobblemon_tasks:cobblemon_task"
+				}
+			]
+			x: 8.0d
+			y: 4.5d
+		}
+		{
+			dependencies: ["73A150C1A7221BD0"]
+			icon: {
+				id: "cobblesurvival:summon_sigil"
+			}
+			id: "3B2B92B85F91AABA"
+			tasks: [
+				{
+					action: "catch"
+					amount: 1L
+					biome: ""
+					dex_progress: ""
+					dimension: ""
+					form: ""
+					gender: ""
+					id: "3A1DA041487A4346"
+					max_level: 0
+					min_level: 0
+					natures: ""
+					poke_ball_used: ""
+					pokemon: "cobblemon:articuno"
+					pokemon_type: ""
+					region: ""
+					shiny: false
+					time_max: 0L
+					time_min: 0L
+					type: "cobblemon_tasks:cobblemon_task"
+				}
+			]
+			x: 9.5d
+			y: 4.5d
+		}
+		{
+			dependencies: ["73A150C1A7221BD0"]
+			icon: {
+				id: "cobblesurvival:summon_sigil"
+			}
+			id: "1DADE103D473A8DB"
+			tasks: [
+				{
+					action: "catch"
+					amount: 1L
+					biome: ""
+					dex_progress: ""
+					dimension: ""
+					form: ""
+					gender: ""
+					id: "2FCDD8BF421D688F"
+					max_level: 0
+					min_level: 0
+					natures: ""
+					poke_ball_used: ""
+					pokemon: "cobblemon:moltres"
+					pokemon_type: ""
+					region: ""
+					shiny: false
+					time_max: 0L
+					time_min: 0L
+					type: "cobblemon_tasks:cobblemon_task"
+				}
+			]
+			x: 2.0d
+			y: 6.0d
+		}
 	]
 }