docs(evidence): preserve endpoint direction in D0 summary

The portable manifest collapsed the two clean-split directions even though
the governing endpoint table permits a bisect only when 7599661 is uniform
green and 724b785 is uniform red. Preserve that direction explicitly, and
carry the same distinction in the compact active-work summary.

The inverted split remains a real difference, but it contradicts the onset
reading and therefore requires that reading to be re-examined before any
bisect.

docs/active-work.md

@@ -412,10 +412,13 @@ from #171 and #215.
   D0a stops). A sweep red only on **unrelated** rows is a `green` run;
   both outcomes occur in the historical logs — `…-708693` is a void
   (compile failure), and `…-2839374`/`…-830195` are unrelated-red with
-  both copies passing. A bisect of
+  both copies passing. A bisect of `7599661..724b785` is permitted
-  `7599661..724b785` is permitted **only on a clean split** — all N red
+  **only on the expected-direction clean split** — all N green at
-  one side, all N green the other. A mixed result means the failure is
+  `7599661`, all N red at `724b785`. The inverted split is a real
-  intermittent under fixed source and **no bisect is justified**.
+  difference but contradicts the onset reading, so it is recorded and
+  that reading is re-examined before any bisect. A mixed result means
+  the failure is intermittent under fixed source and **no bisect is
+  justified**.
 - **Red full-sweep count is SEVEN, not five** (F1–F7 in the manifest),
   each with its own log digest; revision 3 said 5/5 while the framing
   separately cited a gate run the manifest never listed.

docs/probe-sigint-evidence.md

@@ -181,8 +181,13 @@ log digest. Two constraints learned the hard way:
   the bisect-step policy. In summary, keeping the two conclusions with
   the verdicts they actually belong to:
 
-  - **clean split** (one endpoint uniform green, the other uniform red)
+  - **expected-direction clean split** (`7599661` uniform green,
-    → a bisect of `7599661..724b785` is permitted;
+    `724b785` uniform red) → a bisect of `7599661..724b785` is
+    permitted;
+  - **inverted clean split** (`7599661` uniform red, `724b785` uniform
+    green) → the commits differ, but the observed direction contradicts
+    the onset reading; record it and re-examine that reading before any
+    bisect;
   - **mixed at either endpoint** → the failure is **intermittent under
     fixed source**; no bisect;
   - **both endpoints uniform the same way**, green or red → **the