chore(mods): reconcile sides for distribution mod changes

Added picaxe (both). Pruned 5 stale keys for removed jars: LittleFrames,
waterframes, watermedia, watervision (WaterMedia stack dropped from the
pack) and the orphan iris key. sides keys 135→131 = current dist count.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mods-sides.json

@@ -20,7 +20,6 @@
   "JadeAddons-1.21.1-NeoForge-6.1.0.jar": "both",
   "JustEnoughProfessions-neoforge-1.21.1-4.0.5.jar": "both",
   "JustEnoughResources-NeoForge-1.21.1-1.6.0.17.jar": "client",
-  "LittleFrames_NEOFORGE_v1.4.7_mc1.21.1.jar": "both",
   "MouseTweaks-neoforge-mc1.21-2.26.1.jar": "client",
   "Neat-1.21-47-NEOFORGE.jar": "both",
   "Necronomicon-NeoForge-1.6.0+1.21.jar": "both",
@@ -86,7 +85,6 @@
   "handcrafted-neoforge-1.21.1-4.0.3.jar": "both",
   "interiors-1.21.1-neoforge-0.6.1.jar": "both",
   "inventoryessentials-neoforge-1.21.1-21.1.15.jar": "both",
-  "iris-neoforge-1.8.12+mc1.21.1.jar": "client",
   "jamlib-neoforge-1.3.6+1.21.1.jar": "both",
   "jei-1.21.1-neoforge-19.27.0.340.jar": "both",
   "konkrete_neoforge_1.9.9_MC_1.21.jar": "client",
@@ -104,6 +102,7 @@
   "modernfix-neoforge-5.27.12+mc1.21.1.jar": "both",
   "morefunctionalstorage-1.2.3.jar": "both",
   "moreoverlays-1.24.2-mc1.21.1-neoforge.jar": "client",
+  "picaxe-1.21.1-neoforge-1.0.9.jar": "both",
   "polymorph-neoforge-1.1.0+1.21.1.jar": "both",
   "ponderjs-neoforge-1.21.1-2.4.0.jar": "client",
   "resourcefullib-neoforge-1.21-3.0.12.jar": "both",
@@ -127,9 +126,6 @@
   "txnilib-neoforge-1.0.24-1.21.1.jar": "both",
   "utilitarian-1.21.1-0.19.2.jar": "both",
   "voicechat-neoforge-1.21.1-2.6.18.jar": "both",
-  "waterframes-NEOFORGE-mc1.21.1-v2.1.23.jar": "client",
-  "watermedia-2.1.37.jar": "client",
-  "watervision-NF-mc1.21.1-v0.1.0-alpha.jar": "client",
   "welcomescreen-neoforge-1.0.0-1.21.1.jar": "client",
   "wm_binaries-3.0.0-rc.1.jar": "client",
   "yeetusexperimentus-neoforge-87.0.0.jar": "client",