feat(task-017): implement git publishing dry-run and commit flow

apps/backend/src/domain/contracts/openapi.py

@@ -75,7 +75,11 @@ from .models import (
     PlanRevisionRequest,
     PlanSummary,
     PlanUpdateRequest,
+    PublishCommitCreateResponse,
+    PublishCommitListResponse,
     PublishCommitSummary,
+    PublishingDryRunResponse,
+    PublishingStatusResponse,
     PublishingRules,
     ResearchArtifactManifestSummary,
     ResearchArtifactSummary,
@@ -200,6 +204,10 @@ CONTRACT_SCHEMA_MODELS: tuple[type[BaseModel], ...] = (
     SeoReviewReportResponse,
     SeoReviewRunResponse,
     PublishCommitSummary,
+    PublishCommitCreateResponse,
+    PublishCommitListResponse,
+    PublishingDryRunResponse,
+    PublishingStatusResponse,
     RunnerFileRef,
     AgentJobSummary,
     AgentJobTestCodexRequest,