Add Agentic Workflows as a new resource type

Add support for contributing Agentic Workflows — AI-powered repository
automations that run coding agents in GitHub Actions, defined in markdown
with natural language instructions (https://github.github.com/gh-aw).

Changes:
- Create workflows/ directory for community-contributed workflows
- Add workflow metadata parsing (yaml-parser.mjs)
- Add workflow README generation (update-readme.mjs, constants.mjs)
- Add workflow data to website generation (generate-website-data.mjs)
- Update README.md, CONTRIBUTING.md, and AGENTS.md with workflow docs,
  contributing guidelines, and code review checklists

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

eng/constants.mjs

@@ -127,6 +127,36 @@ Hooks enable automated workflows triggered by specific events during GitHub Copi
 - Track usage analytics
 - Integrate with external tools and services
 - Custom session workflows`,
+
+  workflowsSection: `## ⚡ Agentic Workflows
+
+[Agentic Workflows](https://github.github.com/gh-aw) are AI-powered repository automations that run coding agents in GitHub Actions. Defined in markdown with natural language instructions, they enable event-triggered and scheduled automation with built-in guardrails and security-first design.`,
+
+  workflowsUsage: `### How to Use Agentic Workflows
+
+**What's Included:**
+- Each workflow is a folder containing a \`README.md\` and one or more \`.md\` workflow files
+- Workflows are compiled to \`.lock.yml\` GitHub Actions files via \`gh aw compile\`
+- Workflows follow the [GitHub Agentic Workflows specification](https://github.github.com/gh-aw)
+
+**To Install:**
+- Install the \`gh aw\` CLI extension: \`gh extension install github/gh-aw\`
+- Copy the workflow \`.md\` file to your repository's \`.github/workflows/\` directory
+- Compile with \`gh aw compile\` to generate the \`.lock.yml\` file
+- Commit both the \`.md\` and \`.lock.yml\` files
+
+**To Activate/Use:**
+- Workflows run automatically based on their configured triggers (schedules, events, slash commands)
+- Use \`gh aw run <workflow>\` to trigger a manual run
+- Monitor runs with \`gh aw status\` and \`gh aw logs\`
+
+**When to Use:**
+- Automate issue triage and labeling
+- Generate daily status reports
+- Maintain documentation automatically
+- Run scheduled code quality checks
+- Respond to slash commands in issues and PRs
+- Orchestrate multi-step repository automation`,
 };
 
 const vscodeInstallImage =
@@ -152,6 +182,7 @@ const AGENTS_DIR = path.join(ROOT_FOLDER, "agents");
 const SKILLS_DIR = path.join(ROOT_FOLDER, "skills");
 const HOOKS_DIR = path.join(ROOT_FOLDER, "hooks");
 const PLUGINS_DIR = path.join(ROOT_FOLDER, "plugins");
+const WORKFLOWS_DIR = path.join(ROOT_FOLDER, "workflows");
 const COOKBOOK_DIR = path.join(ROOT_FOLDER, "cookbook");
 const MAX_PLUGIN_ITEMS = 50;
 
@@ -182,6 +213,7 @@ export {
   SKILLS_DIR,
   TEMPLATES,
   vscodeInsidersInstallImage,
-  vscodeInstallImage
+  vscodeInstallImage,
+  WORKFLOWS_DIR
 };