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-refactor-dry.md

@@ -0,0 +1,53 @@
+---
+name: sentinel refactor-dry
+description: Preview refactoring changes without applying them
+---
+
+# /sentinel refactor-dry
+
+Analyze and preview refactoring opportunities without making changes.
+
+## Visual Output
+
+```
++----------------------------------------------------------------------+
+|  CODE-SENTINEL - Refactor Preview                                    |
++----------------------------------------------------------------------+
+```
+
+## Usage
+```
+/sentinel refactor-dry <target> [--all]
+```
+
+**Target:** File path, function name, or "." for current file
+**--all:** Show all opportunities, not just recommended
+
+## Skills to Load
+
+- skills/refactoring-patterns.md
+- skills/dry-run-workflow.md
+
+## Process
+
+1. **Scan Target** - Analyze code using patterns from skill
+2. **Score Opportunities** - Rate by Impact/Risk/Effort (see dry-run-workflow skill)
+3. **Output** - Group by recommended vs optional
+
+## Output Format
+
+```
+## Refactoring Opportunities: <target>
+
+### Recommended (High Impact, Low Risk)
+1. **pattern** at lines X-Y
+   - Impact: High | Risk: Low
+   - Run: `/sentinel refactor <target> --pattern=<pattern>`
+
+### Optional
+- Lower priority items
+
+### Summary
+- X recommended, Y optional
+- Estimated complexity reduction: Z%
+```