research: Mathematica Notebooks deep dive; SHARD-WP-0004 T2

Original computational notebook (.nb = a Wolfram expression); confirms
UC-84 notebook page shape is a genus. Refinements: nestable cell groups
(outline tree), structured re-evaluable outputs (new opacity point).
Manipulate/Dynamic = snapshot-only. Enrichment-only (UC-84/54/55).
Marks T2 done.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

research/260614-mathematica-deep-dive/README.md

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+# 260614 — Mathematica Notebooks deep dive
+
+Date: 2026-06-14 · Source: **SHARD-WP-0004 T2**
+
+## What this is
+
+A deep dive into **Wolfram Mathematica Notebooks** — the **original computational notebook**
+(1988), the ancestor Jupyter descends from. The `.nb` document **is itself a Wolfram Language
+expression** (`Notebook[{Cell[…], …}]`) with **nested cell groups**, kernel evaluation
+(`In`/`Out`), **structured (symbolic/graphics) results**, live `Manipulate`/`Dynamic`
+widgets, and CDF as a reduced-runtime distribution projection.
+
+## Why it matters
+
+- Confirms the **notebook page shape (UC-84) is a genus**, not a Jupyter quirk: cells +
+  cached outputs + fragile counter provenance + kernel-gated re-execution predate `.ipynb`.
+- Two refinements: notebooks have **nestable cell groups (an outline tree)**, not just an
+  ordered list; outputs can be **structured re-evaluable values**, not only MIME blobs →
+  adds a "structured re-evaluable value" point to the content-opacity spectrum.
+- `Manipulate`/`Dynamic` join the **static-projection-impossible** end (snapshot-only) —
+  foreshadows Strudel (T5).
+
+## Yield
+
+- **No new UC** (lineage/reinforcement). Reinforces **UC-84**; enriches **UC-54, UC-55**;
+  links UC-34, UC-83.
+
+## Contents
+
+| Path | Role |
+|------|------|
+| `findings.md` | `.nb` expression/cell model, evaluation & provenance, CDF, capability delta vs Jupyter, INTENT mapping, UC disposition (enrichment-only), architecture notes |