diff --git a/routing/test/fixtures/build-mini-graph.mjs b/routing/test/fixtures/build-mini-graph.mjs
index 1e30d83..85d0270 100644
--- a/routing/test/fixtures/build-mini-graph.mjs
+++ b/routing/test/fixtures/build-mini-graph.mjs
@@ -8,6 +8,11 @@
  * bot/src/, web/src/, or routing/src/ imports it. Tests consume the
  * COMMITTED binary; only a deliberate fixture redesign re-runs this.
  *
+ * PROVENANCE (Phase 8 plan 08-01): routing/test/fixtures/mini-graph-arg1.bin
+ * holds the frozen ARG1-era bytes preserved expressly as the v1
+ * decode-rejection vector consumed by the G-suite — it is NOT regenerated
+ * by this script, ever.
+ *
  * Usage:   node routing/test/fixtures/build-mini-graph.mjs
  * Exit:    0 on write; throws on any invariant violation (never writes).
  *
diff --git a/routing/test/fixtures/mini-graph-arg1.bin b/routing/test/fixtures/mini-graph-arg1.bin
new file mode 100644
index 0000000..cb12325
Binary files /dev/null and b/routing/test/fixtures/mini-graph-arg1.bin differ