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/commands/doc-stale-docs.md

@@ -0,0 +1,53 @@
+---
+name: doc stale-docs
+description: Detect documentation files that are stale relative to their associated code
+---
+
+# /doc stale-docs
+
+Identify documentation files that may be outdated based on commit history.
+
+## Skills to Load
+
+- skills/staleness-metrics.md
+- skills/drift-detection.md
+
+## Visual Output
+
+```
++------------------------------------------------------------------+
+|  DOC-GUARDIAN - Stale Documentation Check                        |
++------------------------------------------------------------------+
+```
+
+## Process
+
+1. **Map Documentation to Code**
+   Execute `skills/staleness-metrics.md` - build relationships
+
+2. **Analyze Commit History**
+   For each doc file:
+   - Find last commit that modified the doc
+   - Find last commit that modified related code
+   - Count commits to code since doc was updated
+
+3. **Calculate Staleness**
+   Use levels from skill (Fresh/Aging/Stale/Critical)
+
+4. **Output**
+   Use format from `skills/staleness-metrics.md`
+
+## Options
+
+| Flag | Description | Default |
+|------|-------------|---------|
+| `--threshold <n>` | Commits behind to flag | 10 |
+| `--days` | Use days instead | false |
+| `--path <dir>` | Scan directory | Project root |
+| `--show-fresh` | Include fresh docs | false |
+
+## Exit Codes
+
+- 0: No critical or stale docs
+- 1: Stale docs found
+- 2: Critical docs found