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/prometheus-md-only/index.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, test, beforeEach, afterEach, mock } from "bun:test"
+import { afterAll, describe, expect, test, beforeEach, afterEach, mock } from "bun:test"
 import { mkdirSync, rmSync, writeFileSync } from "node:fs"
 import { join } from "node:path"
 import { tmpdir } from "node:os"
@@ -11,6 +11,10 @@ mock.module("../../shared/opencode-storage-detection", () => ({
   resetSqliteBackendCache: () => {},
 }))
 
+afterAll(() => {
+  mock.restore()
+})
+
 const { createPrometheusMdOnlyHook } = await import("./index")
 const { MESSAGE_STORAGE } = await import("../../features/hook-message-injector")