feat(perf): ship ModernFix dynamic_resources, add Flerovium and Iris Flywheel Compat

Bench (proxy 9900X/7800XT, see analysis/client-perf/RESULTS-proxy.md):
- ModernFix mixin.perf.dynamic_resources=true: startup -7.6 s, S1 p99
  9.11 -> 8.48 ms, S2 1% low 236 -> 264 fps (B6). Enforced packwiz file
  because ModernFix reads it before Default Options. Missing-texture check
  waived by owner; issues to be reported from play.
- Flerovium 1.1.2 (client): mob-pen S3 p99 ~0.9 ms better (B12b).
- Iris Flywheel Compat 2.4.0 (client): with a shaderpack, Create floor
  p99 13.3 -> 4.0 ms (Flywheel instancing kept under Iris) (B12b).
Deck tier already ships DH's LOW quality preset, so no DH change.

.packwizignore

@@ -70,3 +70,6 @@ config/paxi/datapacks/*
 !config/alexsmobs-common.toml
 !config/fowlplay.json5
 !config/crittersandcompanions-common.json5
+# ModernFix mixin overrides (build.py SHIP; enforced - ModernFix reads it before
+# Default Options runs). dynamic_resources=true per bench B6.
+!config/modernfix-mixins.properties

analysis/client-perf/proposed-configs/build.py

@@ -29,10 +29,10 @@ REPO = HERE.parents[2]
 # What `--ship` copies from out/T-default into the repo, and where.
 # Default Options seeds these client-side only, and only if the file is absent
 # (see README §1). Not shipped: sable-client.toml and sodium-options.json (no change
-# from upstream). modernfix-mixins.properties is held back until bench block B6
-# passes; when it does, add it here with destination "config/modernfix-mixins.properties"
-# (enforced packwiz file, because ModernFix reads it before Default Options runs) and
-# re-include it in .packwizignore.
+# from upstream). modernfix-mixins.properties ships as an *enforced* packwiz file
+# (ModernFix reads it before Default Options runs): bench B6 (proxy) showed
+# dynamic_resources -7.6 s startup and better S1/S2 frametimes; owner waived the
+# missing-texture check (2026-10-18) - report issues from play.
 DO = "config/defaultoptions"
 SHIP = {
     "options.txt": f"{DO}/options.txt",
@@ -45,6 +45,7 @@ SHIP = {
         f"{DO}/extra/config/sound_physics_remastered/soundphysics.properties",
     "config/sound_physics_remastered/sound_rates.properties":
         f"{DO}/extra/config/sound_physics_remastered/sound_rates.properties",
+    "config/modernfix-mixins.properties": "config/modernfix-mixins.properties",
 }
 
 # game-dir path -> (base file, format, may_append_new_keys)

config/modernfix-mixins.properties

@@ -0,0 +1 @@
+mixin.perf.dynamic_resources=true

index.toml

@@ -2,11 +2,11 @@ hash-format = "sha256"
 
 [[files]]
 file = "config/akashictome-common.toml"
-hash = "4e479c86ddfec0c5e28f07034f033a10abae404309f38ccc4bfc15da9de2dfa2"
+hash = "190ba9edfb6960b86a2dac84630f9c53ee8f6492b745db92443e92d1dd46b5bd"
 
 [[files]]
 file = "config/alexsmobs-common.toml"
-hash = "bc47ee67032ceab8b2b408819ce9b268812f37da8f13b9b7efeae0deed607c4b"
+hash = "3a5be6512536e29584209b836382cee74d4aad64564df89f041936f58700ec33"
 
 [[files]]
 file = "config/crittersandcompanions-common.json5"
@@ -48,6 +48,10 @@ hash = "62034e0589087dab02d1a15192ad313a57f907d5ee9ebbf8853151f7831851a1"
 file = "config/fowlplay.json5"
 hash = "09ad767a358310e9d38e632ba0e670b0afd1554c162eadb6928d106df17b66c3"
 
+[[files]]
+file = "config/modernfix-mixins.properties"
+hash = "ca92e91a2d856d42e4a5b1ba1900fbed0e942bcbeddd75c0195a2375ade75695"
+
 [[files]]
 file = "config/paxi/datapacks/onion-fixes/data/adorablehamsterpets/recipe/cucumber_crate.json"
 hash = "21b11674b18c3fb0d8292095cf7c12bca82ef4054ec3f1cd8d1e0222d1655629"
@@ -614,6 +618,11 @@ file = "mods/fishermans-haven.pw.toml"
 hash = "d72a60c2053f10a447bdd05577674eeb8d0253a3ca02cb40776e063db556dda2"
 metafile = true
 
+[[files]]
+file = "mods/flerovium.pw.toml"
+hash = "9ab20de2d63037f055d6b614013389e0198068bab536dfd62eebd913e5222fe1"
+metafile = true
+
 [[files]]
 file = "mods/fowlplay.pw.toml"
 hash = "549e72a053da13a50404bd0901b75ce25c6045e778d5a89afcf58e9b5e1945f5"
@@ -729,6 +738,11 @@ file = "mods/inventory-particles.pw.toml"
 hash = "7ff791a8a6074a5f580a0a1899de69cff45ccf6db0a99d83494d57ff1a4cee43"
 metafile = true
 
+[[files]]
+file = "mods/iris-flw-compat.pw.toml"
+hash = "ed85b2ed42beb6523223eef6f0ae397ed29f8059b2bf5aa08d8598de04865614"
+metafile = true
+
 [[files]]
 file = "mods/iris-veil-compat.pw.toml"
 hash = "69f9051c61c05546a2bf008654149a101814842bc2bf384df5c0ee0d64301ccd"

mods/flerovium.pw.toml

@@ -0,0 +1,13 @@
+name = "Flerovium"
+filename = "flerovium-neoforge-1.21.1-1.1.2-all.jar"
+side = "client"
+
+[download]
+url = "https://cdn.modrinth.com/data/4Rh1Mobu/versions/oU1q3eIj/flerovium-neoforge-1.21.1-1.1.2-all.jar"
+hash-format = "sha512"
+hash = "6301ea6991768832fa983f61e1b0574336aea4920e027632a3df93c8a10f5d87041876fad516d16827d9cd13a84b5a8c334c1a0076ca04121e321939d5d6ea52"
+
+[update]
+[update.modrinth]
+mod-id = "4Rh1Mobu"
+version = "oU1q3eIj"

mods/iris-flw-compat.pw.toml

@@ -0,0 +1,13 @@
+name = "Iris & Oculus Flywheel Compat"
+filename = "iris-flywheel-compat-NeoForge-2.4.0.jar"
+side = "client"
+
+[download]
+url = "https://cdn.modrinth.com/data/ndHYMY2K/versions/6ZQz5Ow2/iris-flywheel-compat-NeoForge-2.4.0.jar"
+hash-format = "sha512"
+hash = "192e5f00f2c146d2920867d7cd691ecec7ddd2acfb95880cc59084e8949225db92ecfb9221ba7223fc924ec43f2ca861115f83f9dc3f79e14a2f2a8db5287070"
+
+[update]
+[update.modrinth]
+mod-id = "ndHYMY2K"
+version = "6ZQz5Ow2"

pack.toml

@@ -6,7 +6,7 @@ pack-format = "packwiz:1.1.0"
 [index]
 file = "index.toml"
 hash-format = "sha256"
-hash = "a541a5c87ef6ab98ce6c87526cc192e19ba9cccdbf197388de1394dfb1124a8b"
+hash = "fa466ffeb5cefd0adac6b88b4ed08bb5b2fe0a138f49e9f2d6ea99b8fee70af3"
 
 [versions]
 minecraft = "1.21.1"