feat: Anti-Fake-Evidence System (Phase 1-4b)

Implement full evidence integrity pipeline to prevent compliance theater:
- Confidence levels (E0-E4), truth status tracking, assertion engine
- Four-Eyes approval workflow, audit trail, reject endpoint
- Evidence distribution dashboard, LLM audit routes
- Traceability matrix (backend endpoint + Compliance Hub UI tab)
- Anti-fake badges, control status machine, normative patterns
- 2 migrations, 4 test suites, MkDocs documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-compliance/components/sdk/Sidebar/SDKSidebar.tsx

@@ -643,6 +643,19 @@ export function SDKSidebar({ collapsed = false, onCollapsedChange }: SDKSidebarP
             collapsed={collapsed}
             projectId={projectId}
           />
+          <AdditionalModuleItem
+            href="/sdk/assertions"
+            icon={
+              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+                  d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4" />
+              </svg>
+            }
+            label="Assertions"
+            isActive={pathname === '/sdk/assertions'}
+            collapsed={collapsed}
+            projectId={projectId}
+          />
           <AdditionalModuleItem
             href="/sdk/dsms"
             icon={