feat(contract-validator): add validate_workflow_integration tool (v5.7.1)

Domain Advisory Pattern Hardening - patch release to close gaps from v5.6.0/v5.7.0:

## Added
- New `validate_workflow_integration` MCP tool validates domain plugins expose
  required advisory interfaces (gate command, review command, advisory agent)
- New `MISSING_INTEGRATION` issue type for workflow integration validation
- New `WorkflowIntegrationResult` Pydantic model for structured validation output
- `integrates_with` field on viz-platform and data-platform in marketplace.json
  declaring projman integration metadata
- 4 new test cases for workflow integration validation

## Fixed
- scripts/setup.sh banner version updated from v5.1.0 to v5.7.1

## Documentation
- Updated mcp-tools-reference.md with new tool
- Updated validation-rules.md with Workflow Integration Checks section
- Added /design-gate, /design-review, /data-gate, /data-review to COMMANDS-CHEATSHEET
- Added contract-validator to CONFIGURATION.md plugin table
- Updated README.md Contract Validator tools table

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Project management plugins with Gitea and NetBox integrations",
-    "version": "5.7.0"
+    "version": "5.7.1"
   },
   "plugins": [
     {
@@ -167,7 +167,15 @@
       "hooks": ["./hooks/hooks.json"],
       "category": "data",
       "tags": ["pandas", "postgresql", "postgis", "dbt", "data-engineering", "etl"],
-      "license": "MIT"
+      "license": "MIT",
+      "integrates_with": {
+        "projman": {
+          "domain_label": "Domain/Data",
+          "gate_command": "/data-gate",
+          "review_command": "/data-review",
+          "advisory_agent": "data-advisor"
+        }
+      }
     },
     {
       "name": "viz-platform",
@@ -183,7 +191,15 @@
       "hooks": ["./hooks/hooks.json"],
       "category": "visualization",
       "tags": ["dash", "plotly", "mantine", "charts", "dashboards", "theming", "dmc"],
-      "license": "MIT"
+      "license": "MIT",
+      "integrates_with": {
+        "projman": {
+          "domain_label": "Domain/Viz",
+          "gate_command": "/design-gate",
+          "review_command": "/design-review",
+          "advisory_agent": "design-reviewer"
+        }
+      }
     },
     {
       "name": "contract-validator",