fix(runtime): preserve tool result facts in compaction

tests/unit/context-compactor-tool-results.test.ts

@@ -0,0 +1,87 @@
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
+import { describe, expect, it } from "vitest";
+import { compactMessagesIfNeeded } from "../../src/main/agent-runtime/context-compactor";
+
+function textOf(message: AgentMessage): string {
+  const content = (message as { content?: unknown }).content;
+  if (!Array.isArray(content)) return "";
+  const first = content[0] as { text?: string } | undefined;
+  return first?.text ?? "";
+}
+
+function makeLongTranscript(olderFacts: AgentMessage[]): AgentMessage[] {
+  const messages: AgentMessage[] = [
+    {
+      role: "user",
+      content: [{ type: "text", text: `Ship the approval workflow.\n${"context ".repeat(12_000)}` }],
+      timestamp: 1,
+    } as AgentMessage,
+    ...olderFacts,
+  ];
+
+  for (let i = 0; i < 42; i += 1) {
+    messages.push({
+      role: i % 2 === 0 ? "user" : "assistant",
+      content: [{ type: "text", text: `recent turn ${i}\n${"tail ".repeat(4_000)}` }],
+      timestamp: 100 + i,
+    } as AgentMessage);
+  }
+  return messages;
+}
+
+describe("context compactor tool result facts", () => {
+  it("preserves task, approval, message, status, decision, and error facts from tool results", () => {
+    const messages = makeLongTranscript([
+      {
+        role: "assistant",
+        content: [
+          { type: "text", text: "I will request approval for the deliverable." },
+          {
+            type: "toolCall",
+            id: "call-approval",
+            name: "file_approval",
+            args: { taskId: "task_123" },
+          },
+        ],
+        timestamp: 2,
+      } as AgentMessage,
+      {
+        role: "toolResult",
+        toolCallId: "call-approval",
+        content: [{
+          type: "text",
+          text: JSON.stringify({
+            ok: false,
+            taskId: "task_123",
+            approvalId: "approval_456",
+            messageId: "message_789",
+            status: "blocked",
+            decision: "requires_human_review",
+            error: "missing reviewer",
+          }),
+        }],
+        details: {
+          taskId: "task_123",
+          approvalId: "approval_456",
+          messageId: "message_789",
+          status: "blocked",
+          decision: "requires_human_review",
+          error: "missing reviewer",
+        },
+        timestamp: 3,
+      } as AgentMessage,
+    ]);
+
+    const outcome = compactMessagesIfNeeded(messages);
+    expect(outcome.changed).toBe(true);
+    const summary = textOf(outcome.messages?.[0] as AgentMessage);
+
+    expect(summary).toContain("file_approval");
+    expect(summary).toContain("taskId=task_123");
+    expect(summary).toContain("approvalId=approval_456");
+    expect(summary).toContain("messageId=message_789");
+    expect(summary).toContain("status=blocked");
+    expect(summary).toContain("decision=requires_human_review");
+    expect(summary).toContain("error=missing reviewer");
+  });
+});