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/viz-platform/commands/viz-breakpoints.md

@@ -0,0 +1,43 @@
+---
+description: Configure responsive breakpoints for dashboard layouts
+---
+
+# Configure Breakpoints
+
+## Skills to Load
+- skills/mcp-tools-reference.md
+- skills/responsive-design.md
+
+## Visual Output
+
+```
++------------------------------------------------------------------+
+|  VIZ-PLATFORM - Breakpoints                                      |
++------------------------------------------------------------------+
+```
+
+Configure responsive breakpoints for mobile-first design across screen sizes.
+
+## Usage
+
+```
+/breakpoints {layout_ref}
+```
+
+## Arguments
+
+- `layout_ref` (required): Layout name to configure breakpoints for
+
+## Workflow
+
+1. **User invokes**: `/breakpoints my-dashboard`
+2. **Agent asks**: Which breakpoints to customize? (shows current settings)
+3. **Agent asks**: Mobile column count? (xs, typically 1-2)
+4. **Agent asks**: Tablet column count? (md, typically 4-6)
+5. **Agent applies**: Breakpoint configuration via `layout_set_breakpoints`
+6. **Agent returns**: Complete responsive configuration
+
+## Related Commands
+
+- `/dashboard {template}` - Create layout with default breakpoints
+- `/theme {name}` - Theme includes default spacing values