diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index a0eb85f..9785c69 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Project management plugins with Gitea and NetBox integrations",
-    "version": "5.5.0"
+    "version": "5.6.0"
   },
   "plugins": [
     {
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d536f47..3e9cd37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,23 @@ All notable changes to the Leo Claude Marketplace will be documented in this fil
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [5.6.0] - 2026-02-01
+
+### Added
+- **Domain Advisory Pattern**: Cross-plugin integration enabling projman to consult domain-specific plugins during sprint lifecycle
+- **projman**: New `domain-consultation.md` skill for domain detection and gate protocols
+- **viz-platform**: New `design-reviewer` agent for design system compliance auditing
+- **viz-platform**: New `design-system-audit.md` skill defining audit rules and severity levels
+- **viz-platform**: New `/design-review` command for detailed design system audits
+- **viz-platform**: New `/design-gate` command for binary pass/fail validation gates
+- **Labels**: New `Domain/Viz` and `Domain/Data` labels for domain routing
+
+### Changed
+- **projman planner**: Now loads domain-consultation skill and performs domain detection during planning
+- **projman orchestrator**: Now runs domain gates before marking Domain/* labeled issues as complete
+
+---
+
 ## [5.5.0] - 2026-02-01
 
 ### Added
diff --git a/README.md b/README.md
index 564a182..9dc5944 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Leo Claude Marketplace - v5.5.0
+# Leo Claude Marketplace - v5.6.0
 
 A collection of Claude Code plugins for project management, infrastructure automation, and development workflows.
 
@@ -138,7 +138,22 @@ Visualization toolkit with version-locked component validation and design token
 - 5 Page tools for multi-page app structure
 - Dual theme storage: user-level and project-level
 
-**Commands:** `/chart`, `/chart-export`, `/dashboard`, `/theme`, `/theme-new`, `/theme-css`, `/component`, `/accessibility-check`, `/breakpoints`, `/initial-setup`
+**Commands:** `/chart`, `/chart-export`, `/dashboard`, `/theme`, `/theme-new`, `/theme-css`, `/component`, `/accessibility-check`, `/breakpoints`, `/design-review`, `/design-gate`, `/initial-setup`
+
+## Domain Advisory Pattern
+
+The marketplace supports cross-plugin domain advisory integration:
+
+- **Domain Detection**: projman automatically detects when issues involve specialized domains (frontend/viz, data engineering)
+- **Acceptance Criteria**: Domain-specific acceptance criteria are added to issues during planning
+- **Execution Gates**: Domain validation gates (`/design-gate`, `/data-gate`) run before issue completion
+- **Extensible**: New domains can be added by creating advisory agents and gate commands
+
+**Current Domains:**
+| Domain | Plugin | Gate Command |
+|--------|--------|--------------|
+| Visualization | viz-platform | `/design-gate` |
+| Data (planned) | data-platform | `/data-gate` |
 
 ## MCP Servers
 
diff --git a/plugins/projman/skills/label-taxonomy/labels-reference.md b/plugins/projman/skills/label-taxonomy/labels-reference.md
index c86d299..0c73786 100644
--- a/plugins/projman/skills/label-taxonomy/labels-reference.md
+++ b/plugins/projman/skills/label-taxonomy/labels-reference.md
@@ -13,7 +13,7 @@ description: Dynamic reference for Gitea label taxonomy (organization + reposito
 
 This skill provides the current label taxonomy used for issue classification in Gitea. Labels are **fetched dynamically** from Gitea and should never be hardcoded.
 
-**Current Taxonomy:** 47 labels (31 organization + 16 repository)
+**Current Taxonomy:** 49 labels (31 organization + 18 repository)
 
 ## Organization Labels (31)
 
@@ -66,7 +66,7 @@ Organization-level labels are shared across all repositories in your configured
 - `Status/Failed` (#de350b) - Implementation attempted but failed, needs investigation
 - `Status/Deferred` (#6554c0) - Moved to a future sprint or backlog
 
-## Repository Labels (16)
+## Repository Labels (18)
 
 Repository-level labels are specific to each project.
 
@@ -90,6 +90,27 @@ Repository-level labels are specific to each project.
 - `Tech/Vue` (#42b883) - Vue.js frontend framework
 - `Tech/FastAPI` (#009688) - FastAPI backend framework
 
+### Domain (2 labels)
+
+Cross-plugin integration labels for domain-specific validation gates.
+
+| Label | Color | Description |
+|-------|-------|-------------|
+| `Domain/Viz` | `#7c4dff` | Issue involves visualization/frontend — triggers viz-platform design gates |
+| `Domain/Data` | `#00bfa5` | Issue involves data engineering — triggers data-platform data gates |
+
+**Detection Rules:**
+
+**Domain/Viz:**
+- Keywords: "dashboard", "chart", "theme", "DMC", "component", "layout", "responsive", "color", "UI", "frontend", "Dash", "Plotly"
+- Also applied when: `Component/Frontend` or `Component/UI` label is present
+- Example: "Create new neighbourhood comparison dashboard tab"
+
+**Domain/Data:**
+- Keywords: "schema", "migration", "pipeline", "dbt", "table", "column", "query", "PostgreSQL", "lineage", "data model"
+- Also applied when: `Component/Database` or `Component/Data` label is present
+- Example: "Add census demographic data pipeline"
+
 ## Label Suggestion Logic
 
 When suggesting labels for issues, consider the following patterns: