fix: add healthCommand mock to CLI error handler tests

The healthCommand was added to src/commands/index.ts via PR #35 but
these test files were not updated to include it in their mock.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ckorhonen

test/cli-api-error.test.ts

@@ -12,6 +12,7 @@ vi.mock("../src/commands/index.js", () => ({
   searchCommand: () => new Command("search"),
   swapsCommand: () => new Command("swaps"),
   tokensCommand: () => new Command("tokens"),
+  healthCommand: () => new Command("health"),
 }))
 
 const exitSpy = vi

test/cli-network-error.test.ts

@@ -11,6 +11,7 @@ vi.mock("../src/commands/index.js", () => ({
   searchCommand: () => new Command("search"),
   swapsCommand: () => new Command("swaps"),
   tokensCommand: () => new Command("tokens"),
+  healthCommand: () => new Command("health"),
 }))
 
 const exitSpy = vi

test/cli-rate-limit.test.ts

@@ -12,6 +12,7 @@ vi.mock("../src/commands/index.js", () => ({
   searchCommand: () => new Command("search"),
   swapsCommand: () => new Command("swaps"),
   tokensCommand: () => new Command("tokens"),
+  healthCommand: () => new Command("health"),
 }))
 
 const exitSpy = vi