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/code-sentinel/commands/sentinel.md

@@ -0,0 +1,15 @@
+---
+description: Security scanning and code refactoring
+---
+
+# /sentinel
+
+Security scanning and safe code refactoring tools.
+
+## Sub-commands
+
+| Sub-command | Description |
+|-------------|-------------|
+| `/sentinel scan` | Full security audit (SQL injection, XSS, secrets, etc.) |
+| `/sentinel refactor` | Apply refactoring patterns to improve code |
+| `/sentinel refactor-dry` | Preview refactoring without applying changes |