feat: add Claude Agent SDK wrapper with session create/resume

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/services/claude.ts

@@ -0,0 +1,52 @@
+import { query } from "@anthropic-ai/claude-agent-sdk";
+
+export interface ClaudeResult {
+  sessionId: string;
+  result: string;
+}
+
+export class ClaudeService {
+  async createSession(prompt: string, cwd: string): Promise<ClaudeResult> {
+    let sessionId = "";
+    let result = "";
+
+    for await (const message of query({
+      prompt,
+      options: {
+        cwd,
+        permissionMode: "bypassPermissions",
+        allowedTools: [
+          "Read", "Write", "Edit", "Bash", "Glob", "Grep",
+          "WebSearch", "WebFetch", "Agent",
+        ],
+      },
+    })) {
+      if (message.type === "system" && message.subtype === "init") {
+        sessionId = message.session_id;
+      }
+      if ("result" in message && typeof message.result === "string") {
+        result = message.result;
+      }
+    }
+
+    return { sessionId, result };
+  }
+
+  async sendMessage(prompt: string, sessionId: string): Promise<string> {
+    let result = "";
+
+    for await (const message of query({
+      prompt,
+      options: {
+        resume: sessionId,
+        permissionMode: "bypassPermissions",
+      },
+    })) {
+      if ("result" in message && typeof message.result === "string") {
+        result = message.result;
+      }
+    }
+
+    return result;
+  }
+}