[DO NOT MERGE] Architecture + memory-benchmark deck (Marp)

[FBumann]

⚠️ DO NOT MERGE — draft / preview only. Opened to share and review the
presentation, not to land it. Do not merge without an explicit go-ahead.

A compact three-slide Marp deck (plain markdown in docs/, editable and
git-tracked; renders to slides/PDF/HTML with marp docs/relational.md):

1. What is the problem? — imperative, solver-coupled, dense build → O(dense dim product) memory.
2. What we built (MVP) — YAML → typed AST → two differential-tested backends, with the flat-memory benchmark (13.6× lower peak RSS, flat in model size, 107M vars @ 0.57 GB).
3. The architecture — the typed AST as the narrow waist (issue Architecture: the typed AST is the narrow waist (producers / consumers / transformers) #21): one portable, solver-agnostic model with N backends + M renderers/analyzers/transformers. Built already spans 3 of the 4 consumer families (backends, transformers incl. macros + piecewise expansion, the router).

Notes for reviewers

• Sources tracked: docs/relational.md + docs/bench.svg. Rendered .html/.pdf are gitignored (rebuildable).
• Frames SPEC §12 and issue Architecture: the typed AST is the narrow waist (producers / consumers / transformers) #21 for presentation; makes no code changes.

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