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>

docs/licenses.md

@@ -46,6 +46,7 @@ Read each license before adding a mod, and add a row here in the same change.
 | Cobbreeding | Ludichat, Fuzuki | "MIT, no AI, no reupload" ([text](https://fuzuki.dev/~fuzuki/mit-no-ai-no-reupload.txt)): MIT terms, but the mod may not be used to train or improve machine-learning models, and may not be reuploaded unchanged to CurseForge or Modrinth except bundled in a modpack | [Modrinth](https://modrinth.com/mod/cobbreeding), [source](https://gitlab.com/ludichat/Cobbreeding) | Phase 5: breeding (both). Referenced only, never copied. Not on CurseForge by the authors' choice |
 | Cloth Config API | shedaniel | LGPL-3.0-only | [Modrinth](https://modrinth.com/mod/cloth-config) | Cobbreeding dependency (client) |
 | Iris Shaders | IrisShaders (coderbot, IMS and contributors) | LGPL-3.0-only | [Modrinth](https://modrinth.com/mod/iris) | Phase 9: runs shader packs (client) |
+| spark | lucko and contributors | GPL-3.0-only | [Modrinth](https://modrinth.com/mod/spark) | Phase 9: server profiler for playtests (server only) |
 | Complementary Shaders - Reimagined | EminGT (Complementary Development) | [Complementary License Agreement](https://github.com/ComplementaryDevelopment/ComplementaryReimagined/blob/main/License.txt) | [Modrinth](https://modrinth.com/shader/complementary-reimagined) | Phase 9: the included shader pack, off by default (client). Allowed in modpacks unmodified and only through Modrinth's or CurseForge's own systems, never as an uploaded file |
 | Cobblemon Quests Reloaded | WinterWolfSV (original); community fork | CC-BY-NC-4.0 (jar metadata; the CurseForge page says "custom", the fork keeps the original's non-commercial license) | [CurseForge](https://www.curseforge.com/minecraft/mc-mods/cobblemon-quest-reloaded) | Phase 8: Cobblemon task types for FTB Quests (both). Not on Modrinth. Non-commercial: fine for this free pack |
 | Cobblemon Info for REI / JEI / EMI | Akkiruk | MIT | [Modrinth](https://modrinth.com/project/qekxLrOP) | Phase 8: spawns, drops and evolutions in JEI (both) |