diff --git a/.gitignore b/.gitignore
index 6ed802d..fe00ca4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -219,3 +219,6 @@ graphify-out/
 
 # ADR-011 precomputed GAUL lookup (small, must be tracked despite *.parquet rule)
 !views_postprocessing/data/gaul_lookup.parquet
+
+# ADR-013 §10 golden fixture: canonical bytes, must be tracked despite *.zip/*.parquet rules
+!tests/fixtures/wire_contract/*
diff --git a/tests/fixtures/wire_contract/fixture_run_0__lr_ged_sb__m000543.arrow.parquet b/tests/fixtures/wire_contract/fixture_run_0__lr_ged_sb__m000543.arrow.parquet
new file mode 100644
index 0000000..c5021f6
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diff --git a/tests/fixtures/wire_contract/fixture_run_0__lr_ged_sb__m000543.tap.zip b/tests/fixtures/wire_contract/fixture_run_0__lr_ged_sb__m000543.tap.zip
new file mode 100644
index 0000000..29c5fc4
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diff --git a/tests/fixtures/wire_contract/fixture_run_0__sidecar.parquet b/tests/fixtures/wire_contract/fixture_run_0__sidecar.parquet
new file mode 100644
index 0000000..15e3363
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