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-setup.md

@@ -0,0 +1,49 @@
+# /initial-setup - Data Platform Setup Wizard
+
+## Skills to Load
+- skills/setup-workflow.md
+- skills/visual-header.md
+
+## Visual Output
+
+Display header: `DATA-PLATFORM - Setup Wizard`
+
+## Usage
+
+```
+/initial-setup
+```
+
+## Workflow
+
+Execute `skills/setup-workflow.md` phases in order:
+
+### Phase 1: Environment Validation
+- Check Python 3.10+ installed
+- Stop if version too old
+
+### Phase 2: MCP Server Setup
+- Locate MCP server (installed or source path)
+- Check/create virtual environment
+- Install dependencies if needed
+
+### Phase 3: PostgreSQL Configuration (Optional)
+- Ask user if they want PostgreSQL access
+- If yes: create `~/.config/claude/postgres.env`
+- Test connection and report status
+
+### Phase 4: dbt Configuration (Optional)
+- Ask user if they use dbt
+- If yes: explain auto-detection via `dbt_project.yml`
+- Check dbt CLI installation
+
+### Phase 5: Validation
+- Verify MCP server can be imported
+- Display summary with component status
+- Inform user to restart session
+
+## Important Notes
+
+- Uses Bash, Read, Write, AskUserQuestion tools (NOT MCP tools)
+- MCP tools unavailable until session restart
+- PostgreSQL and dbt are optional - pandas works without them