Clarify two-file structure in create/update workflow prompts

[Copilot]

The create and update workflow prompts lacked explicit guidance on the two-file architecture that separates prompt content (editable without recompilation) from configuration (requires recompilation).

Changes

Both prompt files now lead with:

• Two-file structure overview with clear separation of concerns
• Decision tree: prompt/behavior changes → agentics/*.md, configuration → workflows/*.md
• Recompilation requirements explicitly stated for each type of change

create-agentic-workflow.md:

• Restructured Step 3 into substeps (3.1-3.3) for each file creation
• Added complete examples showing runtime-import pattern
• Updated PR description template to explain file separation

update-agentic-workflow.md:

• Split update patterns into configuration vs. prompt sections
• Each pattern explicitly states target file and recompilation status
• Enhanced "Prompt Editing Without Recompilation" with file structure diagram

Pattern

.github/
├── agentics/
│   └── workflow-id.md          # Agent prompt - edit without recompile
└── workflows/
    └── workflow-id.md          # Frontmatter + {{#runtime-import agentics/workflow-id.md}}

Agents now consistently create this structure and understand when recompilation is required.

Original prompt

Review the create and update agentic workflows .md prompt file and make sure:

• if a change has to be made in the markdown BODY, it should be made in the runtime-import agentics/*.md file.
• if a change has to be made in the front matter, it should be made in the workflows/*.md agentic workflow file

Always try to edit the agentics/*.md file for prompt updates. The reason is that this allows the user to change the agentic workflow behavior without recompilation.

This task is about editing the prompt files in the .github/aw folder. The goal is not to turn these files into an agentic-workflow. Instead, update the prompts in these files so that when they are used by an agent, the agent creates the correct file structure.

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[pelikhan]

@copilot merge main and recompile