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/contract-validator/commands/cv-list-interfaces.md

@@ -0,0 +1,50 @@
+---
+name: cv list-interfaces
+---
+
+# /cv list-interfaces
+
+## Skills to Load
+- skills/visual-output.md
+- skills/plugin-discovery.md
+- skills/interface-parsing.md
+- skills/mcp-tools-reference.md
+
+## Usage
+
+```
+/cv list-interfaces [marketplace_path]
+```
+
+## Parameters
+
+- `marketplace_path` (optional): Path to marketplace root. Defaults to current project root.
+
+## Workflow
+
+1. **Display header** per `skills/visual-output.md`
+
+2. **Discover plugins** per `skills/plugin-discovery.md`
+
+3. **Parse interfaces** per `skills/interface-parsing.md`
+   - Use `parse_plugin_interface` for each plugin README.md
+   - Extract commands, agents, tools
+
+4. **Display summary table**:
+   ```
+   | Plugin      | Commands | Agents | Tools |
+   |-------------|----------|--------|-------|
+   | projman     | 12       | 4      | 26    |
+   ```
+
+5. **Display per-plugin details**:
+   - List of commands
+   - List of agents
+   - Tool categories
+
+## Examples
+
+```
+/cv list-interfaces
+/cv list-interfaces ~/claude-plugins-work
+```