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/compaction-todo-preserver/index.test.ts

@@ -18,6 +18,7 @@ afterAll(() => {
       update: async () => {},
     },
   }))
+  mock.restore()
 })
 
 function createMockContext(todoResponses: Array<Todo>[]): PluginInput {