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/data-platform/commands/data-lineage-viz.md

@@ -0,0 +1,47 @@
+---
+name: data lineage-viz
+---
+
+# /data lineage-viz - Mermaid Lineage Visualization
+
+## Skills to Load
+- skills/lineage-analysis.md
+- skills/mcp-tools-reference.md
+- skills/visual-header.md
+
+## Visual Output
+
+Display header: `DATA-PLATFORM - Lineage Visualization`
+
+## Usage
+
+```
+/data lineage-viz <model_name> [--direction TB|LR] [--depth N]
+```
+
+## Workflow
+
+1. **Get lineage data**: Use `dbt_lineage` to fetch model dependencies
+2. **Build Mermaid graph**: Apply node shapes from `skills/lineage-analysis.md`
+3. **Output**: Render copy-paste ready Mermaid flowchart
+
+## Options
+
+| Flag | Description |
+|------|-------------|
+| `--direction TB` | Top-to-bottom layout (default: LR) |
+| `--depth N` | Limit lineage depth |
+
+## Examples
+
+```
+/data lineage-viz dim_customers
+/data lineage-viz fct_orders --direction TB
+/data lineage-viz rpt_revenue --depth 2
+```
+
+## Required MCP Tools
+
+- `dbt_lineage` - Get model dependencies (REQUIRED)
+- `dbt_ls` - List dbt resources
+- `dbt_docs_generate` - Generate full manifest if needed