# 260614 — Shard spectrum synthesis (one capability model across nine systems)

Date: 2026-06-14

## What this is

A **synthesis** (no new external research) that reads the nine studied systems *across*
each other and distills them into a single comparative model feeding the **shard adapter
contract** (`SHARD-WP-0002`).

The nine: two conceptual ancestors (**Xanadu**, **ZigZag**), four engines (**XWiki,
TWiki, Foswiki** + the wiki-engines landscape), and three modern tools (**Roam,
Obsidian, Notion**), against the federation/origin research.

Centerpieces:
- **The shard family matrix** — every candidate backend × {substrate, attach mode,
  addressing, structure, history, query, transclusion, →Markdown, write granularity},
  with Xanadu/ZigZag as the ideal anchors.
- **The eleven capability spectra** — the claim that the adapter contract should model
  *positions on spectra* (addressing, content identity, structure, history, query,
  translation, attachment mode, operational envelope, access grant, write granularity,
  content types), each anchored at both ends by a real system, with federation ops
  degrading by position.
- **UC-44–UC-59 → workplan task mapping**, including one genuinely new thread (T16:
  addressing, content identity, dimensional/query navigation).

## Contents

| Path | Role |
|------|------|
| `findings.md` | Family matrix, the eleven spectra, cross-cutting through-lines, UC→task fold-in, recommendations/decisions, escalated open questions |

## Status

Synthesis complete. No new use cases (consolidation only). Feeds `SHARD-WP-0002`: T11
reframed around the eleven spectra; T12 page-model breadth (prose + typed records +
non-Markdown assets + query-defined); T13 history confirmed; T14 three-mode attachment
taxonomy; T15 lossy-with-fidelity-report; **new T16** (addressing, content identity,
dimensional/query navigation). UC coverage in the workplan extended UC-34–UC-43 →
UC-34–UC-59.

**Through-lines recorded:** files-canonical/index-derived is the winning architecture;
fine-grained addressing is real and adoptable (adopt native, fingerprint otherwise);
transclusion ⇄ clone ⇄ embed is one primitive; structure/history federate iff in text;
attach mode is a per-binding capability-gated choice; Notion proves the platform can
*enforce* no-silent-mutation via scoped grants.
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