Draft: seed one reference example that is a finished, publishable product

[tph-kds]

Gap: examples/editable-deck-studio proves the editable-deck contract, but no example demonstrates the full professional lifecycle: polished visual system, publishable embed, evidence-backed content, and performance/accessibility pass - i.e. the "specialist professionalism" bar end to end.

Acceptance:

• Example passes: schema, layout audit (strict), output contract, content audit, WCAG detectors (once gated), performance budget, and export fidelity.
• Includes embedding contract (origin allow-list, sandbox) and a documented publish step.
• Content contains only provable claims (no invented metrics/citations).
• Documented as the canonical "finished product" reference in the skill.

This issue is intentionally a draft seed; refine scope before implementation.