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/pr-review/skills/output-formats.md

@@ -167,9 +167,9 @@ Fix: <suggestion>
 +============================================================+
 
 Ready to review PRs:
-- /pr-review <number>   Full multi-agent review
-- /pr-summary <number>  Quick summary
-- /pr-findings <number> List findings
+- /pr review <number>   Full multi-agent review
+- /pr summary <number>  Quick summary
+- /pr findings <number> List findings
 ```
 
 ## Annotated Diff Format