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/claude-code-hooks/handlers/tool-execute-after-handler.test.ts

@@ -1,4 +1,4 @@
-import { beforeEach, describe, expect, it, mock } from "bun:test"
+import { beforeEach, describe, expect, it, mock, afterAll } from "bun:test"
 
 function isRecord(value: unknown): value is Record<string, unknown> {
   return typeof value === "object" && value !== null && !Array.isArray(value)
@@ -26,6 +26,8 @@ mock.module("../transcript", () => ({
   getTranscriptPath: () => "/tmp/transcript.jsonl",
 }))
 
+afterAll(() => { mock.restore() })
+
 const { createToolExecuteAfterHandler } = await import("./tool-execute-after-handler")
 
 describe("createToolExecuteAfterHandler", () => {