Add emoji frontmatter field

[Copilot]

Adds an optional emoji field to agentic workflow frontmatter for visual representation in listings and UI surfaces.

Changes

• FrontmatterConfig (pkg/workflow/frontmatter_types.go) — new Emoji string field; parsed automatically via the existing JSON marshal/unmarshal path
• Schema (pkg/parser/schemas/main_workflow_schema.json) — emoji registered as an optional string property so the additionalProperties: false validator accepts it
• Docs (docs/src/content/docs/reference/frontmatter.md) — new ### Emoji (emoji:) section after description:

Example

---
emoji: "🤖"
name: My Workflow
on:
  issues:
    types: [opened]
---

[pelikhan]

@copilot

• assign emoji to each agentic workflow in this repository
• show emoji in generated ai footers

[Copilot]

@copilot

• assign emoji to each agentic workflow in this repository
• show emoji in generated ai footers
  ...

Done in the latest commits:

1. Assigned emoji to all 227 agentic workflows — each .md file in .github/workflows/ now has an emoji: frontmatter field (e.g. 🧪 for smoke/test workflows, 🔒 for security, 📊 for analytics, 📝 for docs, 🚀 for release, etc.)

2. Emoji shown in generated AI footers — GH_AW_WORKFLOW_EMOJI is now set as a job-level env var in the compiled safe_outputs job (from ParsedFrontmatter.Emoji). In messages_footer.cjs the default footer template prefixes the workflow name link with the emoji when available:

   > Generated by [🧪 Smoke CI](run_url)
   

   The {emoji} variable is also available in custom footer templates.

[pelikhan]

@copilot merge main and recompile

[Copilot]

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[Copilot]

@copilot merge main and recompile

Done. Merged main, fixed the emoji env var propagation (it was only reaching 70/227 workflows because ParsedFrontmatter is nil for many workflows — switched to reading directly from the raw frontmatter map via FrontmatterEmoji on WorkflowData), and recompiled all 227 workflows. All lock files now carry GH_AW_WORKFLOW_EMOJI.