refactor: Standardize command naming conventions and remove parent relationships

Updates all command files to use consistent naming without parent field:
- Remove parent field from all command frontmatter
- Standardize name field to use simple names instead of prefixed names
- Fix usage patterns for brainstorm commands to use proper workflow namespace
- Add new medium-project-update.sh script for batch updates

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.claude/commands/workflow/session/switch.md

@@ -1,8 +1,8 @@
 ---
-name: workflow-session-switch
+name: switch
 description: Switch to a different workflow session
 usage: /workflow:session:switch <session-id>
-parent: /workflow:session
+
 examples:
   - /workflow:session:switch WFS-oauth-integration
   - /workflow:session:switch WFS-user-profile