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/data-platform/commands/data-setup.md

@@ -1,4 +1,4 @@
-# /initial-setup - Data Platform Setup Wizard
+# /data-setup - Data Platform Setup Wizard
 
 ## Skills to Load
 - skills/setup-workflow.md
@@ -11,7 +11,7 @@ Display header: `DATA-PLATFORM - Setup Wizard`
 ## Usage
 
 ```
-/initial-setup
+/data-setup
 ```
 
 ## Workflow