Add reusable documentation templates to reduce token consumption

[Copilot]

Workflow documentation generation currently consumes 60-70 KB per package with similar structures (navigation, setup, commands, examples, config). This adds five reusable templates in pkg/workflow/templates/ to reduce token usage by ~60-70% while maintaining quality.

Templates

• INDEX.template.md - Navigation hub linking all documentation files
• README.template.md - Setup guide (prerequisites, installation, configuration, troubleshooting)
• QUICKREF.template.md - Command reference with patterns and quick fixes
• EXAMPLE.template.md - Sample outputs, use cases, and result interpretation
• CONFIG.template.md - Configuration reference and deployment checklist

Placeholder System

Templates use {{UPPERCASE_WITH_UNDERSCORES}} syntax for workflow-specific content:

# {{WORKFLOW_NAME}}

{{WORKFLOW_DESCRIPTION}}

## Quick Start

1. **{{QUICK_START_STEP_1}}**
   ```bash
   {{QUICK_START_COMMAND_1}}

Common placeholders: `{{WORKFLOW_NAME}}`, `{{REPOSITORY_URL}}`, `{{COMMAND_1}}`, `{{EXAMPLE_1_TITLE}}`, `{{CONFIG_KEY_1}}`

## Navigation Structure

Templates cross-link to maintain coherent documentation sets:

INDEX.md ──┬──> README.md
├──> QUICKREF.md
├──> EXAMPLE.md
└──> CONFIG.md

## Testing

Test suite validates template structure, placeholder syntax consistency, required sections, internal linking, and markdown correctness.

## Documentation

- `AGENTS.md` - Added template usage section with benefits and patterns
- `pkg/workflow/templates/README.md` - Usage guidelines and examples

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>[plan] Create reusable documentation templates to reduce token usage</issue_title>
> <issue_description>## Objective
> 
> Develop reusable documentation templates (INDEX, README, QUICKREF, EXAMPLE, CONFIG) that reduce token consumption while maintaining quality and consistency.
> 
> ## Context
> 
> Research from githubnext/gh-aw#12193 shows the agent creates similar documentation structures across workflows (~60-70 KB per package with 5-7 files). The consistent patterns (INDEX navigation, README setup, QUICKREF cheat sheets, etc.) suggest opportunities for template reuse to optimize token usage without sacrificing quality.
> 
> ## Approach
> 
> 1. Extract common documentation structures into templates:
>    - `INDEX.md` template with navigation structure
>    - `README.md` template with setup sections
>    - `QUICKREF.md` template with command reference format
>    - `EXAMPLE.md` template with sample output structure
>    - `CONFIG-TEMPLATE.md` template with deployment checklist
> 2. Store templates in `pkg/workflow/templates/` or similar location
> 3. Update agent instructions to reference templates and fill in workflow-specific details
> 4. Measure token reduction vs comprehensive generation
> 
> ## Files to Create
> 
> - `pkg/workflow/templates/INDEX.template.md`
> - `pkg/workflow/templates/README.template.md`
> - `pkg/workflow/templates/QUICKREF.template.md`
> - `pkg/workflow/templates/EXAMPLE.template.md`
> - `pkg/workflow/templates/CONFIG.template.md`
> 
> ## Files to Modify
> 
> - `.github/instructions/*.instructions.md` - Reference templates in agent instructions
> - `pkg/workflow/compiler.go` - Template loading and interpolation logic
> - `AGENTS.md` - Document template usage guidelines
> 
> ## Acceptance Criteria
> 
> - [ ] Templates created for all 5 common documentation files
> - [ ] Templates include placeholder syntax for workflow-specific content
> - [ ] Agent instructions reference templates appropriately
> - [ ] Generated documentation maintains quality standards
> - [ ] Token usage reduced (measure before/after)
> - [ ] Tests validate template interpolation
> 
> ## Reference
> 
> See discussion githubnext/gh-aw#12193 "Recommendations" section: "Template Reuse"
> 
> 
> 
> 
> > AI generated by [Plan Command](https://github.com/githubnext/gh-aw/actions/runs/21427795948) for discussion githubnext/gh-aw#12193
> 
> <!-- gh-aw-agentic-workflow: Plan Command, engine: copilot, run: https://github.com/githubnext/gh-aw/actions/runs/21427795948 -->
> 
> <!-- gh-aw-workflow-id: plan --></issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>



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- Fixes githubnext/gh-aw#12198

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