chore: remove unused _RhizomeImports from test files

- Removed unused _RhizomeImports from:
  - __tests__/compose-decompose.ts
  - __tests__/transactions.ts
  - __tests__/negation.ts
- All tests continue to pass after removal

__tests__/compose-decompose.ts

@@ -1,4 +1,3 @@
-import * as _RhizomeImports from "../src";
 /**
  * Tests for lossless view compose() and decompose() bidirectional conversion
  * Ensures that deltas can be composed into lossless views and decomposed back

__tests__/negation.ts

@@ -1,4 +1,3 @@
-import * as _RhizomeImports from "../src";
 import { Delta } from '../src/core';
 import { NegationHelper } from '../src/features';
 import { RhizomeNode } from '../src/node';

__tests__/transactions.ts

@@ -1,4 +1,3 @@
-import * as _RhizomeImports from "../src";
 import { Delta } from '../src/core';
 import { Lossless } from '../src/views';
 import { RhizomeNode } from '../src/node';