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/stop.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, mock, beforeEach } from "bun:test"
+import { describe, it, expect, mock, beforeEach, afterAll } from "bun:test"
 import type { ClaudeHooksConfig } from "./types"
 import type { StopContext } from "./stop"
 
@@ -17,6 +17,8 @@ mock.module("../../shared/logger", () => ({
   getLogFilePath: () => "/tmp/test.log",
 }))
 
+afterAll(() => { mock.restore() })
+
 const { executeStopHooks } = await import("./stop")
 
 function createStopContext(overrides?: Partial<StopContext>): StopContext {