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/doc-guardian/claude-md-integration.md

@@ -9,11 +9,11 @@ This project uses doc-guardian for automatic documentation synchronization.
 ### Behavior
 - Documentation drift is detected automatically when files change
 - Pending updates are queued silently during work
-- Run `/doc-sync` to apply all pending documentation updates
-- Run `/doc-audit` for a full project documentation review
-- Run `/changelog-gen` to generate changelog from conventional commits
-- Run `/doc-coverage` to check documentation coverage metrics
-- Run `/stale-docs` to find documentation that may be outdated
+- Run `/doc sync` to apply all pending documentation updates
+- Run `/doc audit` for a full project documentation review
+- Run `/doc changelog-gen` to generate changelog from conventional commits
+- Run `/doc coverage` to check documentation coverage metrics
+- Run `/doc stale-docs` to find documentation that may be outdated
 
 ### Documentation Files Tracked
 - README.md (root and subdirectories)