diff --git a/assertions/int2_quant_witness.json b/assertions/int2_quant_witness.json
new file mode 100644
index 0000000000..575782461f
--- /dev/null
+++ b/assertions/int2_quant_witness.json
@@ -0,0 +1,17 @@
+{
+  "id": "W-106-G",
+  "wave": 43,
+  "freeze_date": "2027-01-15",
+  "claim": "INT2 activation variant of TTIHP27a degrades end-to-end accuracy by <= 2.0 pp on (MMLU + GSM8K + HellaSwag) averaged at identical weights, temperature 0.0, deterministic seeds, vs. INT4 activation baseline.",
+  "codebook": [-1.0, 0.0, 0.6180339887498949, 1.0],
+  "codebook_anchor": "phi^-1 cell of Sacred ROM",
+  "bio_mapping": "cortical-column-13 (occipital sparse hue gate)",
+  "reuses_opcodes": ["0xE8 SPARSE_SKIP", "0xED SPARSE_MASK", "0xE2 TOM"],
+  "new_l1_opcodes": [],
+  "new_l2_microcode": ["L2_COL13_INT2_GATE"],
+  "falsifier": "If 3-suite averaged accuracy delta > 2.0 pp on any official harness eval at freeze_date, W-106-G is REFUTED and W43 must be rolled back.",
+  "honest_lane": "R5",
+  "anchor": "phi^2 + phi^-2 = 3",
+  "doi": "10.5281/zenodo.19227877",
+  "silicon_vectors": ["S-177", "S-178", "S-179", "S-180", "S-181", "S-182", "S-183", "S-184"]
+}