diff --git a/crates/vize_marquette/tests/test_run_conformance.rs b/crates/vize_marquette/tests/test_run_conformance.rs
new file mode 100644
index 000000000..510fce53f
--- /dev/null
+++ b/crates/vize_marquette/tests/test_run_conformance.rs
@@ -0,0 +1,54 @@
+//! Cross-language conformance over the shared test-run evidence fixtures.
+//!
+//! The TypeScript package reads the same files, so both implementations must
+//! agree on validation codes, canonical bytes, and the admitted fingerprint.
+
+use std::{fs, path::PathBuf};
+
+use vize_marquette::{
+    TestRunEvidence, canonical_test_run_json, parse_test_run_admission_id, test_run_admission_id,
+    test_run_fingerprint,
+};
+
+fn fixture(name: &str) -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("../../tests/fixtures/test-run-evidence")
+        .join(name)
+}
+
+#[test]
+fn accepts_the_shared_valid_record_and_matches_canonical_artifacts() {
+    let evidence: TestRunEvidence =
+        serde_json::from_slice(&fs::read(fixture("valid.json")).unwrap()).unwrap();
+    assert!(evidence.validate().is_empty());
+
+    let canonical = canonical_test_run_json(&evidence).unwrap();
+    let expected = fs::read_to_string(fixture("valid.canonical")).unwrap();
+    assert_eq!(canonical.as_slice(), expected.trim().as_bytes());
+
+    let fingerprint = fs::read_to_string(fixture("valid.sha256")).unwrap();
+    assert_eq!(
+        test_run_fingerprint(&evidence).unwrap().as_str(),
+        fingerprint.trim()
+    );
+
+    let admission_id = test_run_admission_id(&evidence).unwrap();
+    assert_eq!(
+        parse_test_run_admission_id(&admission_id).unwrap(),
+        fingerprint.trim()
+    );
+}
+
+#[test]
+fn returns_the_shared_invalid_diagnostic_codes() {
+    let evidence: TestRunEvidence =
+        serde_json::from_slice(&fs::read(fixture("invalid.json")).unwrap()).unwrap();
+    let actual = evidence
+        .validate()
+        .into_iter()
+        .map(|diagnostic| diagnostic.code)
+        .collect::<Vec<_>>();
+    let expected: Vec<vize_carton::String> =
+        serde_json::from_slice(&fs::read(fixture("invalid.expected.json")).unwrap()).unwrap();
+    assert_eq!(actual, expected);
+}
diff --git a/tests/fixtures/test-run-evidence/invalid.expected.json b/tests/fixtures/test-run-evidence/invalid.expected.json
new file mode 100644
index 000000000..6de824e1f
--- /dev/null
+++ b/tests/fixtures/test-run-evidence/invalid.expected.json
@@ -0,0 +1,9 @@
+[
+  "VIZE_MARQUETTE_103",
+  "VIZE_MARQUETTE_108",
+  "VIZE_MARQUETTE_125",
+  "VIZE_MARQUETTE_113",
+  "VIZE_MARQUETTE_128",
+  "VIZE_MARQUETTE_128",
+  "VIZE_MARQUETTE_127"
+]
diff --git a/tests/fixtures/test-run-evidence/invalid.json b/tests/fixtures/test-run-evidence/invalid.json
new file mode 100644
index 000000000..2e7938a27
--- /dev/null
+++ b/tests/fixtures/test-run-evidence/invalid.json
@@ -0,0 +1,109 @@
+{
+  "format": "vize.test-run.evidence",
+  "formatVersion": 1,
+  "id": "run-2026-07-21.001",
+  "application": "Example",
+  "environment": "production",
+  "contractFingerprint": "1111111111111111111111111111111111111111111111111111111111111111",
+  "sourceRevision": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+  "release": "0.298.0",
+  "artifact": {
+    "id": "web-bundle",
+    "fingerprint": "2222222222222222222222222222222222222222222222222222222222222222",
+    "sizeBytes": 4096
+  },
+  "startedAt": "2026-07-21T00:00:00.000Z",
+  "completedAt": "2026-07-21T00:10:00.000Z",
+  "validUntil": "2026-07-21T00:10:00.000Z",
+  "runner": {
+    "identity": "ci.runner-1",
+    "authenticationEvidence": {
+      "reference": "sha256:3333333333333333333333333333333333333333333333333333333333333333",
+      "fingerprint": "3333333333333333333333333333333333333333333333333333333333333333"
+    },
+    "isolation": "ephemeral",
+    "invocationFingerprint": "4444444444444444444444444444444444444444444444444444444444444444",
+    "environmentEvidence": {
+      "reference": "sha256:5555555555555555555555555555555555555555555555555555555555555555",
+      "fingerprint": "5555555555555555555555555555555555555555555555555555555555555555"
+    },
+    "environmentFingerprint": "6666666666666666666666666666666666666666666666666666666666666666"
+  },
+  "selection": {
+    "targetIds": ["server", "web"],
+    "suiteIds": ["contract", "unit"]
+  },
+  "targets": [
+    {
+      "id": "web",
+      "kind": "web",
+      "environment": "production"
+    },
+    {
+      "id": "server",
+      "kind": "server",
+      "environment": "production"
+    }
+  ],
+  "suites": [
+    {
+      "id": "contract",
+      "targetId": "server",
+      "kind": "contract",
+      "shardIndex": 1,
+      "shardCount": 1,
+      "outcome": "passed",
+      "passed": 18,
+      "failed": 0,
+      "skipped": 0,
+      "retries": 0,
+      "durationMs": 42000,
+      "invocationFingerprint": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+      "report": {
+        "reference": "https://reports.example/latest",
+        "fingerprint": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+      },
+      "log": {
+        "reference": "sha256:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
+        "fingerprint": "cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"
+      }
+    },
+    {
+      "id": "unit",
+      "targetId": "web",
+      "kind": "unit",
+      "shardIndex": 1,
+      "shardCount": 2,
+      "outcome": "passed",
+      "passed": 56,
+      "failed": 0,
+      "skipped": 0,
+      "retries": 2,
+      "durationMs": 31000,
+      "invocationFingerprint": "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd",
+      "report": {
+        "reference": "sha256:eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
+        "fingerprint": "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"
+      },
+      "log": {
+        "reference": "sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+        "fingerprint": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+      }
+    }
+  ],
+  "verification": {
+    "verifier": "release.verifier",
+    "completedAt": "2026-07-21T00:11:00.000Z",
+    "outcome": "accepted",
+    "targetCount": 2,
+    "suiteCount": 3,
+    "passed": 138,
+    "failed": 0,
+    "skipped": 0,
+    "retries": 0,
+    "evidence": {
+      "reference": "sha256:0000000000000000000000000000000000000000000000000000000000000000",
+      "fingerprint": "0000000000000000000000000000000000000000000000000000000000000000"
+    }
+  }
+}
diff --git a/tests/fixtures/test-run-evidence/valid.canonical b/tests/fixtures/test-run-evidence/valid.canonical
new file mode 100644
index 000000000..5bedab2dc
--- /dev/null
+++ b/tests/fixtures/test-run-evidence/valid.canonical
@@ -0,0 +1 @@
+{"format":"vize.test-run.evidence","formatVersion":1,"id":"run-2026-07-21.001","application":"example","environment":"production","contractFingerprint":"1111111111111111111111111111111111111111111111111111111111111111","sourceRevision":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","release":"0.298.0","artifact":{"id":"web-bundle","fingerprint":"2222222222222222222222222222222222222222222222222222222222222222","sizeBytes":4096},"startedAt":"2026-07-21T00:00:00.000Z","completedAt":"2026-07-21T00:10:00.000Z","validUntil":"2026-07-28T00:10:00.000Z","runner":{"identity":"ci.runner-1","authenticationEvidence":{"reference":"sha256:3333333333333333333333333333333333333333333333333333333333333333","fingerprint":"3333333333333333333333333333333333333333333333333333333333333333"},"isolation":"ephemeral","invocationFingerprint":"4444444444444444444444444444444444444444444444444444444444444444","environmentEvidence":{"reference":"sha256:5555555555555555555555555555555555555555555555555555555555555555","fingerprint":"5555555555555555555555555555555555555555555555555555555555555555"},"environmentFingerprint":"6666666666666666666666666666666666666666666666666666666666666666"},"selection":{"targetIds":["server","web"],"suiteIds":["contract","unit"]},"targets":[{"id":"server","kind":"server","environment":"production"},{"id":"web","kind":"web","environment":"production"}],"suites":[{"id":"contract","targetId":"server","kind":"contract","shardIndex":1,"shardCount":1,"outcome":"passed","passed":18,"failed":0,"skipped":0,"retries":0,"durationMs":42000,"invocationFingerprint":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","report":{"reference":"sha256:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb","fingerprint":"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"},"log":{"reference":"sha256:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc","fingerprint":"cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"}},{"id":"unit","targetId":"web","kind":"unit","shardIndex":1,"shardCount":2,"outcome":"passed","passed":56,"failed":0,"skipped":0,"retries":0,"durationMs":31000,"invocationFingerprint":"dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd","report":{"reference":"sha256:eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee","fingerprint":"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"},"log":{"reference":"sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff","fingerprint":"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"}},{"id":"unit","targetId":"web","kind":"unit","shardIndex":2,"shardCount":2,"outcome":"passed","passed":64,"failed":0,"skipped":0,"retries":0,"durationMs":30500,"invocationFingerprint":"7777777777777777777777777777777777777777777777777777777777777777","report":{"reference":"sha256:8888888888888888888888888888888888888888888888888888888888888888","fingerprint":"8888888888888888888888888888888888888888888888888888888888888888"},"log":{"reference":"sha256:9999999999999999999999999999999999999999999999999999999999999999","fingerprint":"9999999999999999999999999999999999999999999999999999999999999999"}}],"verification":{"verifier":"release.verifier","completedAt":"2026-07-21T00:11:00.000Z","outcome":"accepted","targetCount":2,"suiteCount":3,"passed":138,"failed":0,"skipped":0,"retries":0,"evidence":{"reference":"sha256:0000000000000000000000000000000000000000000000000000000000000000","fingerprint":"0000000000000000000000000000000000000000000000000000000000000000"}}}
\ No newline at end of file
diff --git a/tests/fixtures/test-run-evidence/valid.json b/tests/fixtures/test-run-evidence/valid.json
new file mode 100644
index 000000000..773485da0
--- /dev/null
+++ b/tests/fixtures/test-run-evidence/valid.json
@@ -0,0 +1,131 @@
+{
+  "format": "vize.test-run.evidence",
+  "formatVersion": 1,
+  "id": "run-2026-07-21.001",
+  "application": "example",
+  "environment": "production",
+  "contractFingerprint": "1111111111111111111111111111111111111111111111111111111111111111",
+  "sourceRevision": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+  "release": "0.298.0",
+  "artifact": {
+    "id": "web-bundle",
+    "fingerprint": "2222222222222222222222222222222222222222222222222222222222222222",
+    "sizeBytes": 4096
+  },
+  "startedAt": "2026-07-21T00:00:00.000Z",
+  "completedAt": "2026-07-21T00:10:00.000Z",
+  "validUntil": "2026-07-28T00:10:00.000Z",
+  "runner": {
+    "identity": "ci.runner-1",
+    "authenticationEvidence": {
+      "reference": "sha256:3333333333333333333333333333333333333333333333333333333333333333",
+      "fingerprint": "3333333333333333333333333333333333333333333333333333333333333333"
+    },
+    "isolation": "ephemeral",
+    "invocationFingerprint": "4444444444444444444444444444444444444444444444444444444444444444",
+    "environmentEvidence": {
+      "reference": "sha256:5555555555555555555555555555555555555555555555555555555555555555",
+      "fingerprint": "5555555555555555555555555555555555555555555555555555555555555555"
+    },
+    "environmentFingerprint": "6666666666666666666666666666666666666666666666666666666666666666"
+  },
+  "selection": {
+    "targetIds": ["server", "web"],
+    "suiteIds": ["contract", "unit"]
+  },
+  "targets": [
+    {
+      "id": "web",
+      "kind": "web",
+      "environment": "production"
+    },
+    {
+      "id": "server",
+      "kind": "server",
+      "environment": "production"
+    }
+  ],
+  "suites": [
+    {
+      "id": "unit",
+      "targetId": "web",
+      "kind": "unit",
+      "shardIndex": 2,
+      "shardCount": 2,
+      "outcome": "passed",
+      "passed": 64,
+      "failed": 0,
+      "skipped": 0,
+      "retries": 0,
+      "durationMs": 30500,
+      "invocationFingerprint": "7777777777777777777777777777777777777777777777777777777777777777",
+      "report": {
+        "reference": "sha256:8888888888888888888888888888888888888888888888888888888888888888",
+        "fingerprint": "8888888888888888888888888888888888888888888888888888888888888888"
+      },
+      "log": {
+        "reference": "sha256:9999999999999999999999999999999999999999999999999999999999999999",
+        "fingerprint": "9999999999999999999999999999999999999999999999999999999999999999"
+      }
+    },
+    {
+      "id": "contract",
+      "targetId": "server",
+      "kind": "contract",
+      "shardIndex": 1,
+      "shardCount": 1,
+      "outcome": "passed",
+      "passed": 18,
+      "failed": 0,
+      "skipped": 0,
+      "retries": 0,
+      "durationMs": 42000,
+      "invocationFingerprint": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+      "report": {
+        "reference": "sha256:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+        "fingerprint": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+      },
+      "log": {
+        "reference": "sha256:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
+        "fingerprint": "cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"
+      }
+    },
+    {
+      "id": "unit",
+      "targetId": "web",
+      "kind": "unit",
+      "shardIndex": 1,
+      "shardCount": 2,
+      "outcome": "passed",
+      "passed": 56,
+      "failed": 0,
+      "skipped": 0,
+      "retries": 0,
+      "durationMs": 31000,
+      "invocationFingerprint": "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd",
+      "report": {
+        "reference": "sha256:eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
+        "fingerprint": "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"
+      },
+      "log": {
+        "reference": "sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+        "fingerprint": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+      }
+    }
+  ],
+  "verification": {
+    "verifier": "release.verifier",
+    "completedAt": "2026-07-21T00:11:00.000Z",
+    "outcome": "accepted",
+    "targetCount": 2,
+    "suiteCount": 3,
+    "passed": 138,
+    "failed": 0,
+    "skipped": 0,
+    "retries": 0,
+    "evidence": {
+      "reference": "sha256:0000000000000000000000000000000000000000000000000000000000000000",
+      "fingerprint": "0000000000000000000000000000000000000000000000000000000000000000"
+    }
+  }
+}
diff --git a/tests/fixtures/test-run-evidence/valid.sha256 b/tests/fixtures/test-run-evidence/valid.sha256
new file mode 100644
index 000000000..16a8d047c
--- /dev/null
+++ b/tests/fixtures/test-run-evidence/valid.sha256
@@ -0,0 +1 @@
+05d50948dac24df4c92e3ab6c67d96461fced0f28373d06e9a06755b2a40a85b