feat(ralph): Add ralph plugin for autonomous PRD implementation

- Add /ralph:prd command for PRD generation with clarifying questions
- Add /ralph:convert command to convert PRD to executable JSON
- Include templates: ralph.sh, prompt.md, prd-template.json
- Include example PRD (prd-hello-api.json)
- Update marketplace.json with ralph plugin v1.0.0
- Update README with ralph documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -6,7 +6,8 @@ A collection of Claude Code plugins by Romfast Team.
 
 | Plugin | Description | Version |
 |--------|-------------|---------|
-| [learn](./plugins/learn/) | Domain-based memory with selective loading | 2.0.0 |
+| [learn](./plugins/learn/) | Domain-based memory with selective loading | 3.2.0 |
+| [ralph](./plugins/ralph/) | Autonomous loop for PRD implementation | 1.0.0 |
 
 ## Installation
 
@@ -43,6 +44,18 @@ Captures lessons learned (patterns & gotchas) during development sessions with *
 
 [Full documentation →](./plugins/learn/README.md)
 
+### ralph
+
+Autonomous loop for PRD implementation with Claude Code. Runs Claude Code repeatedly until all tasks from a PRD are complete.
+
+**Features:**
+- PRD generation with clarifying questions via `/ralph:prd`
+- Convert PRD to executable JSON via `/ralph:convert`
+- Autonomous loop script with progress tracking
+- Story-by-story implementation with quality checks
+
+[Full documentation →](./plugins/ralph/README.md)
+
 ## Repository Structure
 
 ```
@@ -50,12 +63,16 @@ claude-plugins/
 ├── .claude-plugin/
 │   └── marketplace.json       # Plugin registry
 ├── plugins/
-│   └── learn/                 # Learn plugin
+│   ├── learn/                 # Learn plugin
+│   │   ├── .claude-plugin/plugin.json
+│   │   ├── commands/
+│   │   ├── rules/
+│   │   └── templates/
+│   └── ralph/                 # Ralph plugin
 │       ├── .claude-plugin/plugin.json
 │       ├── commands/
-│       ├── hooks/
-│       ├── rules/
-│       └── templates/
+│       ├── templates/
+│       └── examples/
 ├── README.md                  # This file
 └── CLAUDE.md                  # Development instructions
 ```