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/comment-checker/cli.test.ts

@@ -1,4 +1,4 @@
-import { describe, test, expect, mock } from "bun:test"
+import { describe, test, expect, mock, afterAll } from "bun:test"
 import { chmodSync, mkdtempSync, writeFileSync } from "node:fs"
 import { join } from "node:path"
 import { tmpdir } from "node:os"
@@ -24,6 +24,8 @@ function createScriptBinary(scriptContent: string): string {
   return binaryPath
 }
 
+afterAll(() => { mock.restore() })
+
 describe("comment-checker CLI", () => {
   describe("lazy initialization", () => {
     test("getCommentCheckerPathSync should be lazy and callable", async () => {