only prompt if we know the language

package.json

···
 	"name": "chainlink-opencode",
 	"private": true,
 	"main": "src/index.ts",
+	"scripts": {
+		"typecheck": "tsc --noEmit"
+	},
 	"devDependencies": {
-		"@types/bun": "latest"
-	},
-	"peerDependencies": {
+		"@types/bun": "latest",
 		"typescript": "^5"
 	},
 	"dependencies": {

src/index.ts

···
-import { readFileSync } from "node:fs";
+import { readFileSync, existsSync } from "node:fs";
 import { type Plugin, tool } from "@opencode-ai/plugin";
 
 /**
···
 }
 
 /**
+ * Finds the path to a rule file for the given language.
+ * Returns the path if found, null otherwise.
+ */
+function findRuleFile(directory: string, language: string): string | null {
+	const paths = [`${directory}/.rules/${language}.md`];
+
+	const rulesDir = process.env.LANGRULES_DIR;
+	if (rulesDir) {
+		paths.push(`${rulesDir}/${language}.md`);
+	}
+
+	for (const rulePath of paths) {
+		if (existsSync(rulePath)) {
+			return rulePath;
+		}
+	}
+	return null;
+}
+
+/**
  * Checks if rules should be prompted for a session/language combo.
  * Returns true if this is the first time, and marks it as read.
  */
···
 						}
 					}
 
-					const paths = [`${directory}/.rules/${languageFile}.md`];
-
-					const rulesDir = process.env.LANGRULES_DIR;
-					if (rulesDir) {
-						paths.push(`${rulesDir}/${languageFile}.md`);
+					const rulePath = findRuleFile(directory, languageFile);
+					if (!rulePath) {
+						return `No rule file found for '${languageFile}'`;
 					}
 
-					for (const rulePath of paths) {
-						try {
-							const content = readFileSync(rulePath, "utf-8");
-							if (content.trim()) return content.trim();
-						} catch (error) {}
-					}
+					try {
+						const content = readFileSync(rulePath, "utf-8");
+						if (content.trim()) return content.trim();
+					} catch (error) {}
 
 					return `No rule file found for '${languageFile}'`;
 				},
···
 
 			const language = getLanguageFromFilePath(filePath);
 			if (!language) return;
+
+			if (!findRuleFile(directory, language)) return;
 
 			if (shouldPromptForRules(sessionID, language)) {
 				const ext = filePath.split(".").pop()?.toLowerCase() || "";