[andrewtdiz]

Summary

• remove the stale known-failure entry for node-suite/stream/async-iter/return-method-explicit
• keep the DeepWiki reference and experiment notes local/untracked

Verification

• ./run_parity_tests.sh --suite node-suite --module stream --filter async-iter/return-method-explicit (before removal): PASS, report test-parity/reports/parity_report_20260527_201845.json
• ./run_parity_tests.sh --suite node-suite --module stream --filter async-iter/return-method-explicit (after removal): PASS, report test-parity/reports/parity_report_20260527_201907.json
• jq empty test-parity/known_failures.json
• git diff --check