feat: implement GEWU service and local agent workflows

docs/acceptance/2026-10-14-contradiction-bundle.md

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+# Contradiction bundle acceptance
+
+A synthetic proposal carries two separate factual nodes, each with its own exact citation to an archived source extraction, and a `contradicts` edge with explicit conditions and interpretation rationale. Policy explicitly permits this edge type. The domain validator accepts the complete bundle, and the acceptance integration test publishes both nodes and the edge in one canonical commit. The test reads the committed YAML back through the strict record parser and verifies both claims and the edge are preserved (`tests/domain/test_validation.py`, `tests/application/test_acceptance.py`).
+
+This proves deterministic validation and atomic storage of a contradiction bundle. The service does not independently determine that the facts conflict; the relationship interpretation is supplied by the proposal author and remains subject to the recorded evidence and support assessment. Real source qualification, reversible merge history, and protected owner authorization remain open.