Add Ralph Loop workflow example for iterative task execution

[Copilot]

Implements the Ralph Loop pattern: an AI workflow that iterates through a PRD task list, executing each task autonomously with human oversight via PR review.

Core Components

• .github/workflows/ralph-loop-basic.md - Workflow reads JSON PRD, selects first incomplete task with satisfied dependencies using jq, executes via Copilot engine, updates task status, logs progress, creates PR for review
• examples/ralph/prd-example.json - PRD schema with tasks containing id, title, description, status, priority, dependencies[]
• examples/ralph/README.md - Usage instructions, customization options, troubleshooting

Task Selection Logic

# Finds first incomplete task where all dependencies are complete
jq -r '.tasks[] | 
  select(.status == "incomplete") |
  select(
    (.dependencies | length) == 0 or
    all(.dependencies[]; . as $dep | any(.tasks[]; .id == $dep and .status == "complete"))
  )'

Workflow Pattern

Each run processes one task:

1. Parse PRD → 2. Select task → 3. Execute with AI → 4. Quality checks → 5. Mark complete → 6. Create PR

Human merges PR, triggers next run for subsequent task. Continues until all tasks complete.

Security Model

Read-only permissions + safe-outputs.create-pull-request ensures human review before any repository modifications.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[plan] Create basic Ralph Loop workflow example</issue_title>
<issue_description>## Objective

Implement a basic Ralph Loop workflow that demonstrates the core pattern: iterating through a list of tasks until all are complete.

Context

This is the foundational workflow that implements the Ralph Loop pattern. It should read a PRD-like structure, pick an incomplete task, execute it, and mark it complete.

Approach

1. Create .github/workflows/ralph-loop-basic.md with:

   • Frontmatter defining the PRD structure (list of tasks)
   • Logic to find the first incomplete task
   • Execute the task using Copilot CLI
   • Mark task as complete
   • Commit changes if quality checks pass

2. Use JSON file for task tracking (similar to prd.json in Ralph)

3. Include minimal quality checks:

   • Basic linting
   • Unit tests (if applicable)

4. Add progress tracking to append-only file

Files to Create

• .github/workflows/ralph-loop-basic.md - Basic Ralph Loop workflow
• examples/ralph/prd-example.json - Example PRD structure
• examples/ralph/README.md - Usage instructions

Acceptance Criteria

• Workflow reads tasks from JSON file
• Workflow selects first incomplete task
• Workflow executes task using AI engine
• Workflow marks task complete on success
• Workflow appends learnings to progress.txt
• README explains how to use the example
  Related to Add Ralph Loop examples for agentic workflows #11132

AI generated by Plan Command for #11132

Comments on the Issue (you are @copilot in this section)

• Fixes [plan] Create basic Ralph Loop workflow example #11134

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