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/hooks/atlas/final-wave-approval-gate.test.ts

@@ -1,4 +1,4 @@
-import { afterEach, beforeEach, describe, expect, mock, test } from "bun:test"
+import { afterEach, beforeEach, describe, expect, mock, test, afterAll } from "bun:test"
 import { randomUUID } from "node:crypto"
 import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
 import { tmpdir } from "node:os"
@@ -29,6 +29,8 @@ mock.module("../../shared/opencode-storage-detection", () => ({
   isSqliteBackend: () => false,
 }))
 
+afterAll(() => { mock.restore() })
+
 const { createAtlasHook } = await import("./index")
 const { MESSAGE_STORAGE } = await import("../../features/hook-message-injector")