shopify-admin: Forms app popup editing skill

[NoamAAO]

Co-Authored-By: Claude Fable 5 noreply@anthropic.com

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Summary by cubic

Adds a new shopify-admin Forms app skill for reliably editing signup popup forms. Covers correct iframe targeting, the discount picker overwrite trap, and safe patterns for text and rich‑text edits.

• New Features
  • New guide at agent-workspace/domain-skills/shopify-admin/forms-app.md.
  • Iframe targeting rules: form editor vs App Bridge modal on forms.shopifyapps.com.
  • Warning: attaching a discount overwrites four copy fields; reapply before saving.
  • Editing patterns: use Input.insertText for inputs; for rich text triple‑click then send CDP char events; avoid press_key; verify via the field’s char counter and confirm the save toast.

^{Written for commit c59339d. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}