fix(pi): harden image read mime

src/agents/pi-embedded-utils.ts

@@ -0,0 +1,44 @@
+import type { AssistantMessage } from "@mariozechner/pi-ai";
+
+export function extractAssistantText(msg: AssistantMessage): string {
+  const isTextBlock = (
+    block: unknown,
+  ): block is { type: "text"; text: string } => {
+    if (!block || typeof block !== "object") return false;
+    const rec = block as Record<string, unknown>;
+    return rec.type === "text" && typeof rec.text === "string";
+  };
+
+  const blocks = Array.isArray(msg.content)
+    ? msg.content
+        .filter(isTextBlock)
+        .map((c) => c.text.trim())
+        .filter(Boolean)
+    : [];
+  return blocks.join("\n").trim();
+}
+
+export function inferToolMetaFromArgs(
+  toolName: string,
+  args: unknown,
+): string | undefined {
+  if (!args || typeof args !== "object") return undefined;
+  const record = args as Record<string, unknown>;
+
+  const p = typeof record.path === "string" ? record.path : undefined;
+  const command =
+    typeof record.command === "string" ? record.command : undefined;
+
+  if (toolName === "read" && p) {
+    const offset =
+      typeof record.offset === "number" ? record.offset : undefined;
+    const limit = typeof record.limit === "number" ? record.limit : undefined;
+    if (offset !== undefined && limit !== undefined) {
+      return `${p}:${offset}-${offset + limit}`;
+    }
+    return p;
+  }
+  if ((toolName === "edit" || toolName === "write") && p) return p;
+  if (toolName === "bash" && command) return command;
+  return p ?? command;
+}