refactor: update internal command references in all plugin files

Updated:
- projman: 4 commands + 4 skills + integration snippet
- git-flow: 4 commands + 3 skills + integration snippet
- pr-review: 1 command cross-reference
- cmdb-assistant: 1 command + 1 skill
- data-platform: 8 commands + integration snippet
- viz-platform: 11 commands + integration snippet
- contract-validator: 1 command + 1 skill + 1 agent

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

plugins/viz-platform/commands/accessibility-check.md

@@ -41,5 +41,5 @@ accessibility_validate_theme(theme_name="corporate")
 
 ## Related Commands
 
-- `/theme-new {name}` - Create accessible theme
-- `/chart {type}` - Create chart (check colors after)
+- `/viz-theme-new {name}` - Create accessible theme
+- `/viz-chart {type}` - Create chart (check colors after)