fix(coding-agent): display subagent registration time locally

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed Agent Hub lineage registration timestamps displaying in UTC instead of the user's local timezone.
+
 ## [17.2.12] - 2026-08-08
 
 ### Fixed

packages/coding-agent/src/modes/components/agent-hub.ts

@@ -829,7 +829,19 @@ export class AgentHubOverlayComponent extends Container implements SelectListMou
 			`Spawned by ${sanitizeDisplayText(ref.parentId ?? MAIN_AGENT_ID)}${children.length > 0 ? ` · ${children.length} children` : ""}`,
 		);
 		if (children.length > 0) add(theme.fg("dim", formatChildIds(children, width)));
-		add(theme.fg("dim", `Registered ${new Date(ref.createdAt).toISOString().slice(0, 16).replace("T", " ")}Z`));
+		add(
+			theme.fg(
+				"dim",
+				`Registered ${new Date(ref.createdAt).toLocaleString(undefined, {
+					year: "numeric",
+					month: "short",
+					day: "2-digit",
+					hour: "2-digit",
+					minute: "2-digit",
+					timeZoneName: "short",
+				})}`,
+			),
+		);
 
 		section("Changes");
 		add(

packages/coding-agent/test/agent-hub-ordering.test.ts

@@ -529,6 +529,7 @@ describe("Agent hub row ordering", () => {
 	it("renders aggregate usage and a selected-agent inspector without inventing change attribution", () => {
 		geometry = stubStdoutGeometry(140);
 		geometry.setRows(28);
+		const createdAt = Date.parse("2026-08-09T20:15:00Z");
 		const agents = new AgentRegistry();
 		agents.register({
 			id: "Reviewer",
@@ -541,6 +542,7 @@ describe("Agent hub row ordering", () => {
 				patchPath: "/tmp/Reviewer.patch",
 				branchName: "omp/task/Reviewer",
 			},
+			createdAt,
 		});
 		const observers = new SessionObserverRegistry();
 		vi.spyOn(observers, "getSessions").mockReturnValue([
@@ -584,7 +586,16 @@ describe("Agent hub row ordering", () => {
 			expect(rendered).toContain("Security Reviewer");
 			expect(rendered).toContain("read · src/session/agent-session.ts");
 			expect(rendered).toContain("31K/128K 24%");
-			expect(rendered).toContain("Registered ");
+			expect(rendered).toContain(
+				`Registered ${new Date(createdAt).toLocaleString(undefined, {
+					year: "numeric",
+					month: "short",
+					day: "2-digit",
+					hour: "2-digit",
+					minute: "2-digit",
+					timeZoneName: "short",
+				})}`,
+			);
 			expect(rendered).toContain("Shared workspace · per-agent LoC not attributable");
 			expect(rendered).toContain("Output /tmp/Reviewer.md");
 			expect(rendered).toContain("Patch /tmp/Reviewer.patch");