feat(HAI-082): display tool call details in AgentLogViewer

- Extend AgentLogEntry type with optional detail field for tool metadata
- Thread tool args through engine executor callbacks to populate detail
- Render tool detail (name, args) in AgentLogViewer component
- Add unit tests for store, executor, and AgentLogViewer changes

packages/core/src/store.test.ts

@@ -472,6 +472,30 @@ describe("TaskStore", () => {
       expect(events[0].taskId).toBe(task.id);
     });
 
+    it("appendAgentLog writes detail when provided", async () => {
+      const task = await createTestTask();
+
+      await store.appendAgentLog(task.id, "Bash", "tool", "ls -la");
+      await store.appendAgentLog(task.id, "Read", "tool", "packages/core/src/types.ts");
+      await store.appendAgentLog(task.id, "some text", "text");
+
+      const logs = await store.getAgentLogs(task.id);
+      expect(logs).toHaveLength(3);
+      expect(logs[0].detail).toBe("ls -la");
+      expect(logs[1].detail).toBe("packages/core/src/types.ts");
+      expect(logs[2].detail).toBeUndefined();
+    });
+
+    it("appendAgentLog omits detail field when not provided", async () => {
+      const task = await createTestTask();
+
+      await store.appendAgentLog(task.id, "Bash", "tool");
+
+      const logs = await store.getAgentLogs(task.id);
+      expect(logs).toHaveLength(1);
+      expect(logs[0]).not.toHaveProperty("detail");
+    });
+
     it("handles multiple appends correctly (JSONL format)", async () => {
       const task = await createTestTask();
       for (let i = 0; i < 5; i++) {

packages/core/src/store.ts

@@ -849,13 +849,15 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
    * @param taskId - The task ID (e.g. "HAI-001")
    * @param text - The text content (delta for "text", tool name for "tool")
    * @param type - Whether this is a "text" delta or a "tool" invocation marker
+   * @param detail - Optional human-readable summary of tool args (e.g. file path, command)
    */
-  async appendAgentLog(taskId: string, text: string, type: "text" | "tool"): Promise<void> {
+  async appendAgentLog(taskId: string, text: string, type: "text" | "tool", detail?: string): Promise<void> {
     const entry: AgentLogEntry = {
       timestamp: new Date().toISOString(),
       taskId,
       text,
       type,
+      ...(detail !== undefined && { detail }),
     };
     const dir = this.taskDir(taskId);
     const logPath = join(dir, "agent.log");

packages/core/src/types.ts

@@ -24,6 +24,8 @@ export interface AgentLogEntry {
   text: string;
   /** Whether this is a text delta or a tool invocation marker */
   type: "text" | "tool";
+  /** For tool entries: human-readable summary of tool args (e.g. file path, command) */
+  detail?: string;
 }
 
 export interface TaskAttachment {