fix(ci): simplify test runner to plain bun test by fixing mock.module() leakage

- Add afterAll(() => { mock.restore() }) to 52 test files missing cleanup
- Rewrite create-tool-guard-hooks.test.ts to use spyOn instead of barrel mock
- Fix skill-mcp-manager OAuth tests with missing mockTokens/mockLogin definitions
- Fix start-work hook: show worktree active block on resume with existing worktree_path
- Extract createWorktreeActiveBlock to worktree-block.ts to avoid circular import
- Replace 80-line isolated test runner CI config with single `bun test` command

src/cli/mcp-oauth/login.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, beforeEach, afterEach, mock } from "bun:test"
+import { afterAll, describe, it, expect, beforeEach, afterEach, mock } from "bun:test"
 
 const mockLogin = mock(() => Promise.resolve({ accessToken: "test-token", expiresAt: 1710000000 }))
 
@@ -11,6 +11,10 @@ mock.module("../../features/mcp-oauth/provider", () => ({
   },
 }))
 
+afterAll(() => {
+  mock.restore()
+})
+
 const { login } = await import("./login")
 
 describe("login command", () => {