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>

docs/COMMANDS-CHEATSHEET.md

@@ -92,7 +92,11 @@ Quick reference for all commands in the Leo Claude Marketplace.
 | **viz-platform** | `/chart-export` | | X | Export charts to PNG, SVG, PDF via kaleido |
 | **viz-platform** | `/accessibility-check` | | X | Color blind validation (WCAG contrast ratios) |
 | **viz-platform** | `/breakpoints` | | X | Configure responsive layout breakpoints |
+| **viz-platform** | `/design-review` | | X | Detailed design system audits |
+| **viz-platform** | `/design-gate` | | X | Binary pass/fail design system validation gates |
 | **viz-platform** | *SessionStart hook* | X | | Checks DMC version (non-blocking warning) |
+| **data-platform** | `/data-review` | | X | Comprehensive data integrity audits |
+| **data-platform** | `/data-gate` | | X | Binary pass/fail data integrity gates |
 | **contract-validator** | `/validate-contracts` | | X | Full marketplace compatibility validation |
 | **contract-validator** | `/check-agent` | | X | Validate single agent definition |
 | **contract-validator** | `/list-interfaces` | | X | Show all plugin interfaces |
@@ -294,4 +298,4 @@ Ensure credentials are configured in `~/.config/claude/gitea.env`, `~/.config/cl
 
 ---
 
-*Last Updated: 2026-01-30*
+*Last Updated: 2026-02-02*

docs/CONFIGURATION.md

@@ -398,6 +398,7 @@ PR_REVIEW_AUTO_SUBMIT=false
 | **code-sentinel** | None | None | None needed |
 | **project-hygiene** | None | None | None needed |
 | **claude-config-maintainer** | None | None | None needed |
+| **contract-validator** | None | None | `/initial-setup` |
 
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