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/git-flow/commands/gitflow-branch-start.md

@@ -0,0 +1,45 @@
+---
+name: gitflow branch-start
+description: Create a new feature/fix/chore branch with consistent naming
+agent: git-assistant
+---
+
+# /gitflow branch-start - Start New Branch
+
+## Skills
+
+- skills/visual-header.md
+- skills/branch-naming.md
+- skills/git-safety.md
+- skills/environment-variables.md
+
+## Purpose
+
+Create a new branch with consistent naming conventions, based on the configured base branch.
+
+## Parameters
+
+| Parameter | Description |
+|-----------|-------------|
+| `<description>` | Brief description for branch name |
+| `--type` | Branch type: feat, fix, chore, docs, refactor |
+| `--issue` | Issue number to include in branch name |
+
+## Workflow
+
+1. **Display header** - Show GIT-FLOW Branch Start header
+2. **Determine type** - Prompt for branch type if not provided
+3. **Get description** - Prompt for description if not provided
+4. **Generate name** - Convert to kebab-case (per branch-naming.md)
+5. **Validate** - Check naming rules, truncate if needed
+6. **Update base** - Checkout and pull base branch
+7. **Create branch** - `git checkout -b <new-branch>`
+8. **Confirm** - Display created branch info
+
+## Output
+
+```
+Branch: feat/add-user-authentication
+Base: development @ abc1234
+Status: Ready for development
+```