refactor: rename command files for namespace consistency

BREAKING CHANGE: All generic command names now prefixed with plugin namespace.
See CHANGELOG.md v7.0.0 for complete rename map.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/data-platform/commands/data-explain.md

@@ -0,0 +1,37 @@
+# /explain - dbt Model Explanation
+
+## Skills to Load
+- skills/dbt-workflow.md
+- skills/lineage-analysis.md
+- skills/mcp-tools-reference.md
+- skills/visual-header.md
+
+## Visual Output
+
+Display header: `DATA-PLATFORM - Model Explanation`
+
+## Usage
+
+```
+/explain <model_name>
+```
+
+## Workflow
+
+1. **Get model info**: Use `dbt_lineage` for metadata (description, tags, materialization)
+2. **Analyze dependencies**: Show upstream/downstream as tree
+3. **Compile SQL**: Use `dbt_compile` to get rendered SQL
+4. **Report**: Purpose, materialization, dependencies, key SQL logic
+
+## Examples
+
+```
+/explain dim_customers
+/explain fct_orders
+```
+
+## Required MCP Tools
+
+- `dbt_lineage` - Get model dependencies
+- `dbt_compile` - Get compiled SQL
+- `dbt_ls` - List related resources