[Artifact Forest 4/9] Add afterwriting Fountain PDF and screenplay-analysis adapter

[szmyty]

Parent: #421
Depends on: #423

Provider candidate: https://github.com/ifrost/afterwriting-labs

Outcome

Adopt/adapt/reject the afterwriting CLI as a focused Fountain publication/report provider.

Observed upstream CLI/docs support Fountain → formatted PDF through Node.js and screenplay analysis/statistics. The upstream CLI documentation explicitly notes direct FDX conversion is not reliable, so FDX normalization should use the screenplay interchange provider rather than pretending afterwriting owns it.

Requirements

• Evaluate current package/release/runtime support and MIT licensing.
• Register Node/runtime and afterwriting provider requirements explicitly.
• Expose Fountain → screenplay PDF as a typed, validated capability.
• Evaluate useful deterministic analysis outputs such as page count, locations, character/dialogue/action statistics; expose only stable proven outputs.
• Bind PDF generation options (paper/profile, title page, page numbers, scene numbering, fonts, etc.) to a versioned Renderflow profile.
• Run with direct argv and bounded process controls.
• Validate produced PDF independently and retain screenplay/source/provider provenance.
• Keep provider-specific formatting options out of core screenplay semantics.

Acceptance criteria

• Fountain → PDF executes through the canonical provider/planner boundary.
• Two runs under pinned source/config/toolchain are reproducible to the documented level; nondeterministic metadata is normalized or reported.
• Output passes PDF structural validation.
• Missing Node/provider/font requirements fail before claiming output.
• Supported analysis/report capabilities have schemas and fixtures.
• FDX is not advertised as an afterwriting CLI input unless current execution evidence proves it.

Non-goals

Replacing general Pandoc PDF rendering or using afterwriting as the screenplay interchange layer.

Provider observation — 2026-09-25

The current public afterwriting-labs README/docs describe an MIT-licensed, Node.js-based CLI for Fountain → PDF plus screenplay statistics/reporting. Its CLI documentation explicitly lists direct FDX conversion as a known issue, so FDX normalization must not be assigned to this provider without new execution evidence.

Re-verify package/runtime health and current maintenance before adopting it as a supported provider.