diff --git a/docs/semantic-parity.md b/docs/semantic-parity.md
index ce92da6..627800e 100644
--- a/docs/semantic-parity.md
+++ b/docs/semantic-parity.md
@@ -11,10 +11,27 @@ shape, or because a test written around Stream's implementation passes.
 - admitted artifact: `sha256:4300104135c6fd35bd13a264b744c5f842c41ee9a51e0cf1c57c9a59640551a2`
   (`receipts/eb95c14.json`, 20/20 suites, built natively on linux/amd64)
 - upstream Jetstream: `f29815c391fc2644f8a3dd36b899fb3697dd1ea6`
-- Atmos: `v0.2.14`
-- Zat: `955e9ca9afb41d66d41e998803f6fcfc8fc4330f` (v0.3.22)
+- Atmos: `v0.2.14` — the Go atproto library upstream Jetstream V2 runs, and the
+  reference for repair, hosting-policy and rate-limiting behaviour. It is
+  *upstream's* dependency, not one of Stream's, so it does not appear in
+  `build.zig.zon`; it is pinned here because rows compare against it.
+- Zat: `955e9ca9afb41d66d41e998803f6fcfc8fc4330f` (v0.3.22) — Stream's own
+  atproto library, and this pin does match `build.zig.zon`.
 - audit date: 2026-07-28
 
+> **The basis commit is behind the artifact that actually ran experiment 6.**
+> This audit is based on Stream `eb95c14`, but the deployed image was `29705cb`
+> (`receipts/29705cb.json`, `sha256:0f45468c…`). Fifteen commits separate them,
+> and three change bootstrap behaviour this audit has rows for: `e2ab25c` deleted
+> the in-flight byte budget, `fb3cea4` made repository parsing concurrent, and
+> `fcc63f8` broke the batch submit/consume deadlock.
+>
+> The basis is deliberately **not** rewritten to `29705cb` here — moving the hash
+> would assert an audit against that commit that nobody has performed, which is
+> precisely the "marked more strongly than it can prove" failure this file opens
+> by forbidding. Treat the bootstrap rows as owed a re-confirmation against
+> `29705cb`, and re-base the audit as its own deliberate act.
+
 Earlier receipts remain valid for the digests they cover — a receipt proves
 those suites passed against *that* image, and that stays true. "Admitted" means
 "earned a receipt", not "current", so confirm an artifact matches the commit