feat: 导出 SproutClaw .sproutclaw 配置

包含 extensions、skills、prompts、settings、auth、models、mcp 等配置。
排除 node_modules、npm 缓存、sessions 等运行时数据。

agent/extensions/pi-mcp-adapter/agent-dir.ts

@@ -0,0 +1,22 @@
+import { CONFIG_DIR_NAME } from "@earendil-works/pi-coding-agent";
+import { homedir } from "node:os";
+import { join, resolve } from "node:path";
+
+export function getAgentDir(): string {
+  const configured =
+    process.env.SPROUTCLAW_CODING_AGENT_DIR?.trim() || process.env.PI_CODING_AGENT_DIR?.trim();
+  if (!configured) {
+    return join(homedir(), CONFIG_DIR_NAME, "agent");
+  }
+  if (configured === "~") {
+    return homedir();
+  }
+  if (configured.startsWith("~/")) {
+    return resolve(homedir(), configured.slice(2));
+  }
+  return resolve(configured);
+}
+
+export function getAgentPath(...segments: string[]): string {
+  return join(getAgentDir(), ...segments);
+}