Suppress orchestrator's own .env.example gitleaks false positive

gitleaks git-mode scans committed history, so the .env.example placeholder flags from
history and would block the orchestrator's own pre-push gate. Suppress it with a written
justification. Also gitignore stray .adf_final*.json left by an unrelated tool.

.gitignore

@@ -7,3 +7,6 @@ __pycache__/
 .pytest_cache/
 .ruff_cache/
 .DS_Store
+
+# Stray Atlassian Document Format exports left by an unrelated tool — not part of this repo.
+.adf_final*.json

.security-review/suppressions.json

@@ -0,0 +1,8 @@
+{
+  "suppressions": [
+    {
+      "id": "gitleaks-generic-api-key-2",
+      "justification": "False positive. .env.example:2 is a documented placeholder token (not a live secret) that exists to show the required env var shape. gitleaks runs in git-mode and scans committed history, so it flags the placeholder even though the working-tree value is inert. No real credential is or was exposed. Reviewed 2026-06-16."
+    }
+  ]
+}