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.md

@@ -0,0 +1,24 @@
+---
+description: Data engineering tools with pandas, PostgreSQL, and dbt
+---
+
+# /data
+
+Data engineering tools with pandas, PostgreSQL/PostGIS, and dbt integration.
+
+## Sub-commands
+
+| Sub-command | Description |
+|-------------|-------------|
+| `/data ingest` | Load data from CSV, Parquet, JSON into DataFrame |
+| `/data profile` | Generate data profiling report with statistics |
+| `/data schema` | Explore database schemas, tables, columns |
+| `/data explain` | Explain query execution plan |
+| `/data lineage` | Show dbt model lineage and dependencies |
+| `/data lineage-viz` | dbt lineage visualization as Mermaid diagrams |
+| `/data run` | Run dbt models with validation |
+| `/data dbt-test` | Formatted dbt test runner with summary |
+| `/data quality` | DataFrame quality checks |
+| `/data review` | Comprehensive data integrity audits |
+| `/data gate` | Binary pass/fail data integrity gates |
+| `/data setup` | Setup wizard for data-platform MCP servers |