Add Render AST and text exporters: JSON, Markdown, HTML simple/rich
- Render AST: placeholder expansion, hierarchical numbering (1, 1.1),
hidden/skipped filtering, preview step limit, annotated image rendering
- JSON exporter with sidecar annotated PNGs
- Markdown exporter: TOC with resolving anchors, text blocks as
blockquotes, fenced code, tables, Azure-wiki image sizing option
- Self-contained HTML exporters (data-URI images, zero external refs);
rich variant adds floating TOC, checkboxes, localStorage progress
- HTML->Markdown converter for the sanitizer-allowed tag set
- 7 exporter workflow tests (42 total)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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