test(coding-agent): update MCP reauth fake for reload deps

reloadServers() now reads ctx.settings and session.setMCPPromptCommands, which
the shared /mcp reauth|unauth harness did not provide, so those tests threw
inside reload and failed their showError assertions. Add both members to the
fake context.

Fixes #7189

packages/coding-agent/test/mcp-command-reauth.test.ts

@@ -69,8 +69,12 @@ function createController(authStorage: AuthStorage, mcpManagerOverrides: Record<
 			pendingProviderId: undefined,
 			tryClaimInput: vi.fn(),
 		},
+		settings: {
+			get: vi.fn((_key: string): unknown => undefined),
+		},
 		session: {
 			refreshMCPTools: vi.fn(),
+			setMCPPromptCommands: vi.fn(),
 			modelRegistry: { authStorage },
 		},
 		mcpManager,