diff --git a/crates/aprender-core/src/format/arch_coop_001_006.rs b/crates/aprender-core/src/format/arch_coop_001_006.rs
new file mode 100644
index 000000000..a16856970
--- /dev/null
+++ b/crates/aprender-core/src/format/arch_coop_001_006.rs
@@ -0,0 +1,335 @@
+// Bundles two sister contracts in one verdict module:
+//
+//   `arch-constraints-v1` (FALSIFY-ARCH-CONSTRAINTS-001..003)
+//   `cooperative-matrix-gemm-v1` (FALSIFY-COOP-001..003)
+//
+// ARCH-CONSTRAINTS-001: every model-family yaml constraints == this contract
+// ARCH-CONSTRAINTS-002: enum exhaustiveness — no unknown enum values
+// ARCH-CONSTRAINTS-003: DeepSeek eps == 1e-6 (regression guard)
+// COOP-001: |coop - tiled| < 1e-3 elementwise
+// COOP-002: coop GFLOPS > 2× tiled GFLOPS
+// COOP-003: fallback path doesn't crash when coop unavailable
+
+/// ARCH-CONSTRAINTS-003: DeepSeek RmsNorm epsilon exact value.
+pub const AC_ARCH_DEEPSEEK_EPS: f32 = 1e-6;
+/// COOP-001: parity tolerance for cooperative-matrix vs tiled GEMM.
+pub const AC_COOP_PARITY_TOLERANCE: f32 = 1e-3;
+/// COOP-002: minimum GFLOPS multiplier (coop must be > 2× tiled).
+pub const AC_COOP_GFLOPS_FLOOR: f32 = 2.0;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ArchCoopVerdict {
+    Pass,
+    Fail,
+}
+
+// ----------------------------------------------------------------
+// ARCH-CONSTRAINTS-001..003
+// ----------------------------------------------------------------
+
+/// ARCH-CONSTRAINTS-001: model-family yaml consistency.
+///
+/// `mismatch_count` = number of (family, field) pairs where the
+/// model-family YAML doesn't match this contract.
+#[must_use]
+pub fn verdict_from_family_consistency(mismatch_count: u32) -> ArchCoopVerdict {
+    if mismatch_count == 0 {
+        ArchCoopVerdict::Pass
+    } else {
+        ArchCoopVerdict::Fail
+    }
+}
+
+/// ARCH-CONSTRAINTS-002: enum exhaustiveness — no unknown values.
+#[must_use]
+pub fn verdict_from_enum_exhaustive(unknown_enum_count: u32) -> ArchCoopVerdict {
+    if unknown_enum_count == 0 {
+        ArchCoopVerdict::Pass
+    } else {
+        ArchCoopVerdict::Fail
+    }
+}
+
+/// ARCH-CONSTRAINTS-003: DeepSeek eps regression guard.
+///
+/// Pass iff `eps == 1e-6` exactly.
+#[must_use]
+pub fn verdict_from_deepseek_eps(eps: f32) -> ArchCoopVerdict {
+    if !eps.is_finite() {
+        return ArchCoopVerdict::Fail;
+    }
+    if eps == AC_ARCH_DEEPSEEK_EPS {
+        ArchCoopVerdict::Pass
+    } else {
+        ArchCoopVerdict::Fail
+    }
+}
+
+// ----------------------------------------------------------------
+// COOP-001..003
+// ----------------------------------------------------------------
+
+/// COOP-001: max|coop - tiled| < AC_COOP_PARITY_TOLERANCE elementwise.
+#[must_use]
+pub fn verdict_from_coop_parity(coop: &[f32], tiled: &[f32]) -> ArchCoopVerdict {
+    if coop.is_empty() || coop.len() != tiled.len() {
+        return ArchCoopVerdict::Fail;
+    }
+    for (a, b) in coop.iter().zip(tiled.iter()) {
+        if !a.is_finite() || !b.is_finite() {
+            return ArchCoopVerdict::Fail;
+        }
+        if (a - b).abs() >= AC_COOP_PARITY_TOLERANCE {
+            return ArchCoopVerdict::Fail;
+        }
+    }
+    ArchCoopVerdict::Pass
+}
+
+/// COOP-002: coop GFLOPS > 2× tiled GFLOPS.
+#[must_use]
+pub fn verdict_from_coop_throughput(coop_gflops: f32, tiled_gflops: f32) -> ArchCoopVerdict {
+    if !coop_gflops.is_finite() || !tiled_gflops.is_finite() {
+        return ArchCoopVerdict::Fail;
+    }
+    if tiled_gflops <= 0.0 || coop_gflops <= 0.0 {
+        return ArchCoopVerdict::Fail;
+    }
+    if coop_gflops > AC_COOP_GFLOPS_FLOOR * tiled_gflops {
+        ArchCoopVerdict::Pass
+    } else {
+        ArchCoopVerdict::Fail
+    }
+}
+
+/// COOP-003: fallback path takes effect on unsupported hardware.
+///
+/// Pass iff:
+///   - coop_supported == true → used_coop, no crash
+///   - coop_supported == false → used_tiled fallback, no crash
+#[must_use]
+#[allow(clippy::fn_params_excessive_bools)]
+pub fn verdict_from_coop_fallback(
+    coop_supported: bool,
+    used_coop_path: bool,
+    used_tiled_fallback: bool,
+    crashed: bool,
+) -> ArchCoopVerdict {
+    if crashed {
+        return ArchCoopVerdict::Fail;
+    }
+    if coop_supported && used_coop_path && !used_tiled_fallback {
+        return ArchCoopVerdict::Pass;
+    }
+    if !coop_supported && !used_coop_path && used_tiled_fallback {
+        return ArchCoopVerdict::Pass;
+    }
+    ArchCoopVerdict::Fail
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // -----------------------------------------------------------------
+    // Section 1: Provenance pin.
+    // -----------------------------------------------------------------
+    #[test]
+    fn provenance_constants() {
+        assert_eq!(AC_ARCH_DEEPSEEK_EPS, 1e-6);
+        assert_eq!(AC_COOP_PARITY_TOLERANCE, 1e-3);
+        assert_eq!(AC_COOP_GFLOPS_FLOOR, 2.0);
+    }
+
+    // -----------------------------------------------------------------
+    // Section 2: ARCH-CONSTRAINTS-001..003.
+    // -----------------------------------------------------------------
+    #[test]
+    fn farch001_pass_no_mismatch() {
+        let v = verdict_from_family_consistency(0);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn farch001_fail_one_mismatch() {
+        let v = verdict_from_family_consistency(1);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn farch002_pass_no_unknown() {
+        let v = verdict_from_enum_exhaustive(0);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn farch002_fail_unknown_present() {
+        let v = verdict_from_enum_exhaustive(3);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn farch003_pass_correct_eps() {
+        let v = verdict_from_deepseek_eps(1e-6);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn farch003_fail_old_default() {
+        let v = verdict_from_deepseek_eps(1e-5);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn farch003_fail_nan() {
+        let v = verdict_from_deepseek_eps(f32::NAN);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    // -----------------------------------------------------------------
+    // Section 3: COOP-001 parity.
+    // -----------------------------------------------------------------
+    #[test]
+    fn fcoop001_pass_within_tolerance() {
+        let coop = vec![1.0_f32, 2.0, 3.0];
+        let tiled = vec![1.0001, 2.0001, 2.9999];
+        let v = verdict_from_coop_parity(&coop, &tiled);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn fcoop001_fail_drift() {
+        let coop = vec![1.0_f32, 2.0];
+        let tiled = vec![1.0, 2.5];
+        let v = verdict_from_coop_parity(&coop, &tiled);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn fcoop001_fail_length_mismatch() {
+        let coop = vec![1.0_f32, 2.0];
+        let tiled = vec![1.0_f32];
+        let v = verdict_from_coop_parity(&coop, &tiled);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn fcoop001_fail_nan() {
+        let coop = vec![1.0_f32, f32::NAN];
+        let tiled = vec![1.0_f32, 2.0];
+        let v = verdict_from_coop_parity(&coop, &tiled);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    // -----------------------------------------------------------------
+    // Section 4: COOP-002 throughput.
+    // -----------------------------------------------------------------
+    #[test]
+    fn fcoop002_pass_3x() {
+        let v = verdict_from_coop_throughput(300.0, 100.0);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn fcoop002_fail_at_2x() {
+        // strict >, not >=
+        let v = verdict_from_coop_throughput(200.0, 100.0);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn fcoop002_fail_below_2x() {
+        let v = verdict_from_coop_throughput(150.0, 100.0);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn fcoop002_fail_zero_tiled() {
+        let v = verdict_from_coop_throughput(300.0, 0.0);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    // -----------------------------------------------------------------
+    // Section 5: COOP-003 fallback.
+    // -----------------------------------------------------------------
+    #[test]
+    fn fcoop003_pass_supported_used_coop() {
+        let v = verdict_from_coop_fallback(true, true, false, false);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn fcoop003_pass_unsupported_used_tiled() {
+        let v = verdict_from_coop_fallback(false, false, true, false);
+        assert_eq!(v, ArchCoopVerdict::Pass);
+    }
+
+    #[test]
+    fn fcoop003_fail_crash() {
+        let v = verdict_from_coop_fallback(false, false, false, true);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn fcoop003_fail_supported_but_used_tiled() {
+        let v = verdict_from_coop_fallback(true, false, true, false);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    #[test]
+    fn fcoop003_fail_unsupported_used_coop() {
+        // The exact regression — would crash on real hardware.
+        let v = verdict_from_coop_fallback(false, true, false, false);
+        assert_eq!(v, ArchCoopVerdict::Fail);
+    }
+
+    // -----------------------------------------------------------------
+    // Section 6: Mutation surveys.
+    // -----------------------------------------------------------------
+    #[test]
+    fn mutation_survey_002_throughput_band() {
+        for ratio_x10 in [10_u32, 19, 20, 21, 25, 30] {
+            let coop = (ratio_x10 as f32 / 10.0) * 100.0;
+            let v = verdict_from_coop_throughput(coop, 100.0);
+            let want = if coop > 200.0 {
+                ArchCoopVerdict::Pass
+            } else {
+                ArchCoopVerdict::Fail
+            };
+            assert_eq!(v, want, "ratio={ratio_x10}");
+        }
+    }
+
+    // -----------------------------------------------------------------
+    // Section 7: Realistic.
+    // -----------------------------------------------------------------
+    #[test]
+    fn realistic_healthy_passes_all_6() {
+        let v1 = verdict_from_family_consistency(0);
+        let v2 = verdict_from_enum_exhaustive(0);
+        let v3 = verdict_from_deepseek_eps(1e-6);
+        let coop = vec![1.0_f32, 2.0];
+        let tiled = vec![1.0001, 2.0001];
+        let v4 = verdict_from_coop_parity(&coop, &tiled);
+        let v5 = verdict_from_coop_throughput(300.0, 100.0);
+        let v6 = verdict_from_coop_fallback(true, true, false, false);
+        for v in [v1, v2, v3, v4, v5, v6] {
+            assert_eq!(v, ArchCoopVerdict::Pass);
+        }
+    }
+
+    #[test]
+    fn realistic_pre_fix_all_6_failures() {
+        let v1 = verdict_from_family_consistency(7);
+        let v2 = verdict_from_enum_exhaustive(2);
+        let v3 = verdict_from_deepseek_eps(1e-5); // pre-fix value
+        let coop = vec![1.0_f32, 2.0];
+        let tiled = vec![1.0, 2.5];
+        let v4 = verdict_from_coop_parity(&coop, &tiled);
+        let v5 = verdict_from_coop_throughput(150.0, 100.0); // not >2×
+        let v6 = verdict_from_coop_fallback(false, true, false, false); // crash class
+        for v in [v1, v2, v3, v4, v5, v6] {
+            assert_eq!(v, ArchCoopVerdict::Fail);
+        }
+    }
+}
diff --git a/crates/aprender-core/src/format/mod.rs b/crates/aprender-core/src/format/mod.rs
index c855d3592..6c4e4fdfb 100644
--- a/crates/aprender-core/src/format/mod.rs
+++ b/crates/aprender-core/src/format/mod.rs
@@ -550,6 +550,12 @@ pub mod gate_ship_011;
 // GATE-SHIP-012 — Line-coverage percentage inclusive-floor threshold (≥ 95.0).
 pub mod gate_ship_012;
 
+// FALSIFY-ARCH-CONSTRAINTS-001..003 + FALSIFY-COOP-001..003 — sister
+// bundle of arch-constraints-v1 (family consistency, enum exhaustive,
+// DeepSeek eps regression) + cooperative-matrix-gemm-v1 (parity
+// 1e-3, throughput >2×, fallback no-crash).
+pub mod arch_coop_001_006;
+
 // Re-export types (PMAT-198 - backward compatibility)
 pub use types::*;