chore: remove inappropriate tests from tarpaulin runs

Cargo.toml

@@ -17,6 +17,9 @@ keywords = ["dag", "async", "task", "parallel", "executor"]
 categories = ["asynchronous", "concurrency", "data-structures"]
 exclude = [".claude/", ".jj/", "dagx-spec.md"]
 
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(tarpaulin)'] }
+
 [dependencies]
 futures = "0.3"
 parking_lot = "0.12"

tests/arc_tests.rs

@@ -1092,6 +1092,7 @@ async fn test_arc_mixed_with_non_arc() {
 
 /// Test 16: Arc in parallel execution paths
 #[tokio::test]
+#[cfg_attr(tarpaulin, ignore)] // Timing tests are unreliable with instrumentation overhead
 async fn test_arc_parallel_execution() {
     struct SharedProducer;
 

tests/boundaries/deep_chains.rs

@@ -304,7 +304,7 @@ async fn test_zigzag_dependencies() -> DagResult<()> {
 }
 
 #[tokio::test]
-#[ignore] // This test is extremely resource intensive
+#[cfg_attr(tarpaulin, ignore)] // This test is extremely resource intensive
 async fn test_10000_level_chain_stress() -> DagResult<()> {
     // Ultimate deep chain test
     let dag = DagRunner::new();

tests/boundaries/large_scale.rs

@@ -213,7 +213,7 @@ async fn test_10000_node_linear_chain_segments() -> DagResult<()> {
 }
 
 #[tokio::test]
-#[ignore] // This test is very resource intensive
+#[cfg_attr(tarpaulin, ignore)] // This test is very resource intensive
 async fn test_100000_nodes_stress() -> DagResult<()> {
     // Ultimate stress test: 100,000 nodes
     let dag = DagRunner::new();