--- Adversarial attack tests for message ID system --- TestAttack_PopToolMsgID_DoublePop tests that calling popToolMsgID twice for the same key return

TestAttack_ToolMsgIDConsistency_MultipleTools is an integration test: when an agent has multiple tools called in one turn, verify that EACH tool's eve

TestAttack_ToolResultToBlocks_EdgeCases verifies toolResultToBlocks handles nil ToolResult, empty Parts, and Parts with nil media fields.

--------------------------------------------------------------------------- TestBeforeModelRewriteState — direct unit tests for BeforeModelRewriteStat

--------------------------------------------------------------------------- Edge-case tests for BeforeModelRewriteState ------------------------------

TestBuildCancelFunc_CASFailStateDone exercises the race-condition path in buildCancelFunc where the CAS on stateRunning→stateCancelling fails because

TestBuildCancelFunc_StateDoneUnderLock exercises the race-condition path in buildCancelFunc where the state transitions to stateDone between the lockl

TestCancel_SafePointNeverFires_ErrExecutionEnded verifies the waitForCompletion path where a safe-point cancel is submitted while the agent is running

Tests for CancelAfterChatModel/CancelAfterToolCalls in nested workflow structures. These verify that safe-point cancel modes propagate through the ent