fix(coding-agent): deferred hub tool renderer access to avoid temporal dead zone

- Convert the hub tool renderer to a lazy getter to prevent initialization-order temporal dead zone issues.
- Add session move support to the fake ACP builtin session runtime.

packages/coding-agent/src/tools/renderers.ts

@@ -90,7 +90,13 @@ export const toolRenderers: Record<string, ToolRenderer> = {
 	grep: grepToolRenderer as ToolRenderer,
 	lsp: lspToolRenderer as ToolRenderer,
 	inspect_image: inspectImageToolRenderer as ToolRenderer,
-	hub: hubToolRenderer as ToolRenderer,
+	// Lazy getter: `hubToolRenderer` lives in a module whose deps (messaging →
+	// persisted-agents → vibe/runtime → task/executor → sdk) close an import
+	// cycle back here, so reading it at init order-dependently hits its
+	// temporal dead zone. Deferring the read to first access sidesteps it.
+	get hub(): ToolRenderer {
+		return hubToolRenderer as ToolRenderer;
+	},
 	read: readToolRenderer as ToolRenderer,
 	// Keyed by xd:// resolution-device names: the write dispatch delegates here
 	// by dispatch tool, and historical `resolve` tool transcripts still render

packages/coding-agent/test/acp-builtins.test.ts

@@ -38,6 +38,7 @@ interface FakeAcpBuiltinSession {
 	model: { provider: string; id: string } | undefined;
 	newSession(opts?: { drop?: boolean; parentSession?: string }): Promise<boolean>;
 	switchSession(sessionPath: string): Promise<boolean>;
+	moveSession(newCwd: string, targetSessionDir?: string): Promise<void>;
 	markMovedFromEmptySessionFile(sessionFile: string): void;
 	fork(): Promise<boolean>;
 	handoff(instr?: string): Promise<{ document: string; savedPath?: string } | undefined>;
@@ -121,6 +122,10 @@ function createRuntime() {
 			await fakeSessionManager.setSessionFile(this._switchedTo);
 			return true;
 		},
+		async moveSession(newCwd: string, _targetSessionDir?: string) {
+			if (!fakeSessionManager) throw new Error("fake session manager not initialized");
+			await fakeSessionManager.moveTo(newCwd);
+		},
 		markMovedFromEmptySessionFile(sessionFile: string) {
 			this._movedFromEmptySessionFile = path.resolve(sessionFile);
 		},