feat: add module summary prompt

packages/llm/src/prompts/module-summary.ts

@@ -0,0 +1,42 @@
+import type { LLMMessage, ModuleNode, FileNode } from "@codeboard/shared";
+
+export function buildModuleSummaryPrompt(
+  module: ModuleNode,
+  files: FileNode[]
+): LLMMessage[] {
+  const fileDetails = files
+    .map((f) => {
+      const fns = f.functions.map((fn) => `    ${fn.name}(${fn.params.join(", ")})`).join("\n");
+      const cls = f.classes.map((c) => `    class ${c.name}`).join("\n");
+      const exps = f.exports.map((e) => `    export ${e.isDefault ? "default " : ""}${e.name}`).join("\n");
+      return `  ${f.path}:\n${fns}\n${cls}\n${exps}`;
+    })
+    .join("\n\n");
+
+  return [
+    {
+      role: "system",
+      content: `You are analyzing a code module. Provide a concise summary.
+
+Output format:
+## Summary
+[1-2 paragraphs explaining what this module does and its role in project]
+
+## Key Files
+[list each important file with a one-line description]
+
+## Public API
+[list main exported functions/classes and what they do]`,
+    },
+    {
+      role: "user",
+      content: `Module: ${module.name} (${module.path})
+Files: ${module.files.length}
+
+FILE DETAILS:
+${fileDetails}
+
+Summarize this module.`,
+    },
+  ];
+}