style: fix ruff lint violations across service and tests

Wraps over-long lines, sorts imports, drops an unused local, and bumps the
agent submodule for its own import-sort fix so make check passes.

scripts/export_schemas.py

@@ -13,6 +13,7 @@ from gewu.domain.contracts import (
     IngestReviewItem,
     KnowledgeNode,
     NeighborRequest,
+    OnlineEvidence,
     ProjectRecord,
     ProposalReceipt,
     ProposalRevision,
@@ -26,7 +27,6 @@ from gewu.domain.contracts import (
     ServiceDiagnostics,
     SourceRevisionRecord,
     TypedEdge,
-    OnlineEvidence,
 )
 
 ROOT = Path(__file__).resolve().parents[1]