Step 59: WebSocketAgentServer with session management, JSON-RPC routing, MockWebSocketTransport (10/10 tests) Step 61: ASTMutationAPI with setProperty, updateNode, deleteNode, insertNode, journal, OptimizationLock warning (6/6 tests) Step 62: ContextAPI with getInScopeSymbols, getCallHierarchy, getDependencyGraph (6/6 tests) Step 63: BatchMutationAPI with atomic applySequence and reverse-order rollback (5/5 tests) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Tests applySequence: successful batch of 3, failed batch rolls back all preceding mutations, journal recording, empty batch, and 5-mutation batch with error at step 3 rolling back all 5. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
