feat: add splatoon-testfire rules

game-rules/splatoon-testfire/metadata.json

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+{
+  "name": "Splatoon Testfire",
+  "iso8601": "2026-05-11T03:42:39.642Z",
+  "version": "1.0.0",
+  "icons": {
+    "icon": "Splatoon_Global_Testfire-HOME_Menu_icon-158439339.png",
+    "banner": "zlCfzTYHDaULU0F7f4.jpg"
+  }
+}

game-rules/splatoon-testfire/rule.md

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+> [!WARNING]  
+> Due to the age of the Splatoon Testfire, there is an risk of being RCE'd under [ENLBufferPwn](https://github.com/PabloMK7/ENLBufferPwn). While this technically falls under General Rule 2 & Testifre Rule 5, it should be noted that if caught and proven to be the offender of RCEs will result in a instant ban. RCE'ing consoles will **NOT** be tolerated under any costs.
+
+### 1. **Allowed Cosmetics and Client Mods**
+
+Cosmetic modifications are permitted. This includes hidden gear, the Octoling model, level spoofers (up to level 99), and ink tanks, provided the ink capacity remains at the vanilla level. Client-side visual mods like ink color changers, ForceNightTime, and model swaps are also allowed.
+
+### 2. **Spoofer Restrictions**
+
+You are allowed to use name changers within reason and icon spoofers. However, spoofing kill reasons or kill targets is strictly prohibited, as these can be used to increase damage or falsely shift blame onto innocent players.
+
+### 3. **Prohibited Weapons and Kits**
+
+The use of hidden weapons (such as `Roller_KingSquid` or `?Shot_Msn0LvX`), custom weapon kits with modified sub/special combinations, and any parameter alterations is strictly banned.
+
+### 4. **Unfair Gameplay Advantages**
+
+Only fair play is allowed. Prohibited cheating methods include infinite ink, rapid-fire, ESP (wallhacks), custom jump markers, or unrestricted movement hacks.
+
+### 5. **Exploits and Disruptions**
+
+Intentionally using crash exploits to disrupt other players' games is banned. This includes rapid-fire ink mines, spamming the ink strike, or purposefully disconnecting during Turf, Ranked, or Splatfest matches.