feat(marketplace): command consolidation + 8 new plugins (v8.1.0 → v9.0.0) [BREAKING]

Phase 1b: Rename all ~94 commands across 12 plugins to /<noun> <action>
sub-command pattern. Git-flow consolidated from 8→5 commands (commit
variants absorbed into --push/--merge/--sync flags). Dispatch files,
name: frontmatter, and cross-reference updates for all plugins.

Phase 2: Design documents for 8 new plugins in docs/designs/.

Phase 3: Scaffold 8 new plugins — saas-api-platform, saas-db-migrate,
saas-react-platform, saas-test-pilot, data-seed, ops-release-manager,
ops-deploy-pipeline, debug-mcp. Each with plugin.json, commands, agents,
skills, README, and claude-md-integration. Marketplace grows from 12→20.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/viz-platform/commands/viz-accessibility-check.md

@@ -0,0 +1,46 @@
+---
+name: viz accessibility-check
+description: Validate color accessibility for color blind users
+---
+
+# /viz accessibility-check
+
+## Skills to Load
+- skills/mcp-tools-reference.md
+- skills/accessibility-rules.md
+
+## Visual Output
+
+```
++------------------------------------------------------------------+
+|  VIZ-PLATFORM - Accessibility Check                              |
++------------------------------------------------------------------+
+```
+
+Validate theme or chart colors for color blind accessibility.
+
+## Usage
+
+```
+/viz accessibility-check {target}
+```
+
+## Arguments
+
+- `target` (optional): "theme" or "chart" - defaults to active theme
+
+## Tool Mapping
+
+```python
+accessibility_validate_colors(
+    colors=["#228be6", "#40c057"],
+    check_types=["deuteranopia", "protanopia", "tritanopia"],
+    min_contrast_ratio=4.5
+)
+accessibility_validate_theme(theme_name="corporate")
+```
+
+## Related Commands
+
+- `/viz theme-new {name}` - Create accessible theme
+- `/viz chart {type}` - Create chart (check colors after)