feat(marketplace): command consolidation + 8 new plugins (v8.1.0 → v9.0.0) [BREAKING]

Phase 1b: Rename all ~94 commands across 12 plugins to /<noun> <action>
sub-command pattern. Git-flow consolidated from 8→5 commands (commit
variants absorbed into --push/--merge/--sync flags). Dispatch files,
name: frontmatter, and cross-reference updates for all plugins.

Phase 2: Design documents for 8 new plugins in docs/designs/.

Phase 3: Scaffold 8 new plugins — saas-api-platform, saas-db-migrate,
saas-react-platform, saas-test-pilot, data-seed, ops-release-manager,
ops-deploy-pipeline, debug-mcp. Each with plugin.json, commands, agents,
skills, README, and claude-md-integration. Marketplace grows from 12→20.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/git-flow/docs/BRANCHING-STRATEGY.md

@@ -104,7 +104,7 @@ gitGraph
    ```
    Or use git-flow command:
    ```
-   /branch-start add user authentication
+   /gitflow branch-start add user authentication
    ```
 
 2. **Implement changes**
@@ -125,7 +125,7 @@ gitGraph
 5. **Cleanup**
    - Delete feature branch after merge
    ```
-   /branch-cleanup
+   /gitflow branch-cleanup
    ```
 
 ### Release Promotion