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/preemptive-compaction.test.ts

@@ -1,6 +1,6 @@
 /// <reference types="bun-types" />
 
-import { describe, it, expect, mock, beforeEach, afterEach } from "bun:test"
+import { afterAll, describe, it, expect, mock, beforeEach, afterEach } from "bun:test"
 
 const ANTHROPIC_CONTEXT_ENV_KEY = "ANTHROPIC_1M_CONTEXT"
 const VERTEX_CONTEXT_ENV_KEY = "VERTEX_ANTHROPIC_1M_CONTEXT"
@@ -28,6 +28,10 @@ mock.module("../shared/logger", () => ({
   log: logMock,
 }))
 
+afterAll(() => {
+  mock.restore()
+})
+
 const { createPreemptiveCompactionHook } = await import("./preemptive-compaction")
 
 function createMockCtx() {