Complete Entrypoint Detection Re-Engineering Program (Sprints 0410-0415) and Sprint 3500.0002.0003 (Proof Replay + API)

Entrypoint Detection Program (100% complete):
- Sprint 0411: Semantic Entrypoint Engine - all 25 tasks DONE
- Sprint 0412: Temporal & Mesh Entrypoint - all 19 tasks DONE
- Sprint 0413: Speculative Execution Engine - all 19 tasks DONE
- Sprint 0414: Binary Intelligence - all 19 tasks DONE
- Sprint 0415: Predictive Risk Scoring - all tasks DONE

Key deliverables:
- SemanticEntrypoint schema with ApplicationIntent/CapabilityClass
- TemporalEntrypointGraph and MeshEntrypointGraph
- ShellSymbolicExecutor with PathEnumerator and PathConfidenceScorer
- CodeFingerprint index with symbol recovery
- RiskScore with multi-dimensional risk assessment

Sprint 3500.0002.0003 (Proof Replay + API):
- ManifestEndpoints with DSSE content negotiation
- Proof bundle endpoints by root hash
- IdempotencyMiddleware with RFC 9530 Content-Digest
- Rate limiting (100 req/hr per tenant)
- OpenAPI documentation updates

Tests: 357 EntryTrace tests pass, WebService tests blocked by pre-existing infrastructure issue

src/Attestor/StellaOps.Attestation.Tests/DsseHelperTests.cs

@@ -44,7 +44,10 @@ public class DsseHelperTests
         var payload = Encoding.UTF8.GetBytes("{}");
 
         var pae = DsseHelper.PreAuthenticationEncoding(payloadType, payload);
-        pae.Should().ContainSubsequence(Encoding.UTF8.GetBytes(payloadType));
-        pae.Should().ContainSubsequence(payload);
+
+        // Verify PAE contains expected components (payload type and payload)
+        var paeString = Encoding.UTF8.GetString(pae);
+        paeString.Should().Contain(payloadType);
+        paeString.Should().Contain("{}");
     }
 }