fix(pi): guard prompt replacement to anthropic-only and preserve pi-coding-agent

modules/home/programs/terminal/pi/config/extensions/replace-pi-with-claude-code.ts

@@ -1,10 +1,17 @@
 import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
 
 export default function replacePiWithClaudeCodeExtension(pi: ExtensionAPI) {
-  pi.on("before_agent_start", async (event) => {
+  pi.on("before_agent_start", async (event, ctx) => {
+    // Anthropic-Only Guard - Other providers (e.g. OpenAI, Google) should
+    // see the unmodified pi system prompt.
+    if (ctx.model?.provider !== "anthropic") {
+      return undefined;
+    }
+
     // Replace "pi" With "claude code" - Exclude Literal ".pi" (e.g. Paths)
+    // And "pi-coding-agent" (Package Name)
     const transformedSystemPrompt = event.systemPrompt.replace(
-      /(?<!\.)pi/gi,
+      /(?<!\.)pi(?!-coding-agent)/gi,
       "claude code",
     );