diff --git a/docs/configuration-parity.md b/docs/configuration-parity.md
index dc18821..0b09cc5 100644
--- a/docs/configuration-parity.md
+++ b/docs/configuration-parity.md
@@ -74,6 +74,7 @@ semantically correct. Status vocabulary is defined in
 | `inspect-segment` | **partial** | A sealed upstream fixture matches the pinned renderer for asserted output; active/partial/checksum cases have Stream tests. | The complete current golden set was not rerun during this audit. |
 | `inspect-all` | **partial** | Representative steady/bootstrap trees, missing roots, active skip, aggregation, sorting, and truncation have fixtures, including a copied upstream report. | It does not replace missing online collections/segments status tabs; complete golden coverage was not independently re-audited. |
 | Go pprof routes | **intentional divergence** | Stream does not expose `/debug/pprof/*` handlers. Zig/process metrics are used instead. | Documented as an explicit intentional divergence. |
+| `--rebloom-sweep` / `JETSTREAM_REBLOOM_SWEEP` | **intentional divergence** | Stream-only operator control: one-shot sweep that right-sizes legacy per-block bloom regions (upstream f02919c changed seal-time sizing only and ships no legacy-migration tool). Allowlisted in `tests/environment_contract.py`; behavior in `docs/configuration.md`. | Remove once the legacy archive is fully right-sized, or keep as an inert no-op. |
 
 ## Required configuration admission
 
diff --git a/tests/environment_contract.py b/tests/environment_contract.py
index 5ed147a..0dcacd0 100644
--- a/tests/environment_contract.py
+++ b/tests/environment_contract.py
@@ -51,10 +51,20 @@ def exact_pinned_map_case() -> None:
             r'\.env = "(JETSTREAM_[^"]+)", \.flag = "([^"]+)"', stream_text
         )
     }
-    assert stream == upstream, (
+    # Stream-only variables: each entry is an intentional divergence recorded
+    # in docs/configuration-parity.md. Anything not listed here must match
+    # upstream exactly.
+    stream_only = {
+        "JETSTREAM_REBLOOM_SWEEP": "rebloom-sweep",
+    }
+    assert not (stream_only.keys() & upstream.keys()), (
+        f"stream_only entries collide with upstream: {sorted(stream_only.keys() & upstream.keys())}"
+    )
+    expected = upstream | stream_only
+    assert stream == expected, (
         f"environment map drift\n"
-        f"missing/wrong: {sorted(upstream.items() - stream.items())}\n"
-        f"extra/wrong: {sorted(stream.items() - upstream.items())}"
+        f"missing/wrong: {sorted(expected.items() - stream.items())}\n"
+        f"extra/wrong: {sorted(stream.items() - expected.items())}"
     )