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/git-flow/skills/merge-workflow.md

@@ -6,7 +6,7 @@ Defines merge strategies, conflict resolution approaches, and post-merge cleanup
 
 ## When to Use
 
-- Merging feature branches in `/commit-merge`
+- Merging feature branches in `/git-commit-merge`
 - Resolving conflicts during sync operations
 - Cleaning up after successful merges