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/plugin/fallback.cliproxyapi-matrix.test.ts

@@ -1,5 +1,5 @@
 declare const require: (name: string) => any
-const { afterEach, describe, expect, mock, test } = require("bun:test")
+const { afterEach, afterAll, describe, expect, mock, test } = require("bun:test")
 
 const PROVIDER_ID = "cliproxyapi"
 
@@ -10,6 +10,8 @@ mock.module("../shared/connected-providers-cache", () => ({
   }),
 }))
 
+afterAll(() => { mock.restore() })
+
 import { createEventHandler } from "./event"
 import { createChatMessageHandler } from "./chat-message"
 import { createModelFallbackHook } from "../hooks/model-fallback/hook"