Add a Slidev-backed product presentation publication profile

[szmyty]

Outcome

Create a provider-neutral Renderflow presentation profile with Slidev as the first adapter, producing an interactive web slideshow and exportable artifacts from reviewed product content.

Reference: https://github.com/slidevjs/slidev

Architecture

Canonical product narrative and approved Identity assets feed a versioned presentation model. Renderflow performs deterministic assembly and validation. Slidev is a replaceable renderer, not the source of product truth.

Scope

• Define slide, section, speaker-note, citation, media, theme, transition, and export contracts.
• Support browser presentation, print/PDF export, and downloadable source package.
• Preserve source revision, generator version, provenance, rights, and freshness.
• Support accessible headings, reading order, alt text, captions/transcripts, keyboard navigation, reduced motion, contrast, and print geometry.
• Provide a synthetic fixture and one reviewed Ego Hygiene product example.

Acceptance criteria

• The versioned presentation model is renderer-neutral.
• Equivalent approved inputs produce deterministic outputs.
• Slidev versions and themes are pinned and reproducible.
• Interactive and exported forms preserve citations and accessibility metadata.
• Live AI/network calls are absent from clean publication builds.
• A product site can embed or link the result without forking the pipeline.
• Documentation covers authoring, preview, validation, export, deployment, and rollback.