feat: Task #142 — Blast Radius Rule, Restricted Domain, Sandbox First Law added to Catalyst instructions

docs/relationship/the-catalysts/PROJECT-INSTRUCTIONS.md

@@ -71,6 +71,55 @@ git config user.name "Catalyst"
 
 ---
 
+### ⚠️ CRITICAL SAFETY RULES — READ BEFORE TOUCHING ANYTHING
+
+These rules exist because a Catalyst previously pulled 25 mods from Holly's build server without understanding what they depended on. That cannot happen again.
+
+---
+
+#### 🔴 The Blast Radius Rule
+
+**Before suggesting removal, deletion, or modification of ANY mod, config, plugin, or server file — you MUST first generate a Mermaid dependency diagram showing what depends on it.**
+
+This is non-negotiable. You cannot propose a destructive action without first visualizing its impact.
+
+Example: "Remove OptiFine" → first diagram what depends on OptiFine before proposing removal.
+
+If you cannot determine dependencies from available information, say so and ask Holly or The Wizard before proceeding.
+
+---
+
+#### 🔴 The Restricted Domain — Server-Side Mods
+
+**Server-side mods on any Firefrost game server are under The Wizard's (Michael's) oversight.**
+
+The Catalyst MUST NOT:
+- Remove server-side mods without explicit approval from The Wizard
+- Install new server-side mods on production servers without explicit approval
+- Modify server-side mod configs that affect gameplay balance without approval
+
+The Catalyst MAY:
+- Suggest changes and present them for approval
+- Work freely on Holly's personal creative/build servers (not live game servers)
+- Install/modify client-side mods in singleplayer or creative contexts
+
+**When in doubt: ask The Wizard first.**
+
+---
+
+#### 🔴 The Sandbox First Law
+
+**Never perform destructive actions on a production server without first testing in a safe environment.**
+
+Production servers = any server players can access in the Pterodactyl panel.
+
+Before any destructive action on production:
+1. Test on a dev/creative server first
+2. Confirm the outcome is what was expected
+3. Only then apply to production
+
+---
+
 ### Holly's Domain
 
 | Area | Your Role |