research: shard-spectrum synthesis v3 (folds SHARD-WP-0003 batch)

Extends the capability model to the nine WP-0003 engines (~23 systems total).
Per-shard spectra 13 -> 14 (adds provenance granularity); refines merge-model
(+fork/journal-replay, +coexist-with-rank), attachment-mode (+git-IS-store,
+container, +direct-DB, +REST/file-store-hybrid, +external-API payload-format
facet), native-query (+SPARQL/RDF far-end), history (+DB-rows, +partial),
structure (+typed-graph, +inline-embedded objects), content-opacity
(+lossy-exportable), write-granularity (+story-item, +section-anchor).

Headline: new federation-model taxonomy (S2.5) -- federation is plural
(fork+journal / VCS-replication+ping / query-time graph join / feed
aggregation / activity streams / engine-mirror), a selectable/composable
coordination-layer axis feeding SHARD-WP-0002 T1-T6. Folds UC-68-82 into the
workplan; no new UCs, no INTENT boundary change.

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

research/README.md

@@ -22,7 +22,7 @@ when multiple files or sources are involved. Findings here inform `spec/` and
 | 2026-06-14 | `260614-roam-deep-dive/` | Roam Research — block-graph DataScript DB, transclusion, datalog, Roam Depot extension API; UC-50/51/52 |
 | 2026-06-14 | `260614-obsidian-deep-dive/` | Obsidian — file-over-app vaults, plugin API, ecosystem-popularity → UC signal; UC-53/54/55/56 |
 | 2026-06-14 | `260614-notion-deep-dive/` | Notion — closed block-DB SaaS, external REST API only, database-as-pages; UC-57/58/59 |
-| 2026-06-14 | `260614-shard-spectrum-synthesis/` | Synthesis — shard family matrix + eleven capability spectra across nine systems; feeds SHARD-WP-0002 T11–T16 |
+| 2026-06-14 | `260614-shard-spectrum-synthesis/` | Synthesis (v3) — shard family matrix + **fourteen** capability spectra across ~23 systems + **federation-model taxonomy** (fork+journal / VCS-replication+ping / query-join / engine-mirror); feeds SHARD-WP-0002 T1–T6 + T11–T16 |
 | 2026-06-14 | `260614-joplin-deep-dive/` | Joplin — SQLite-local/Markdown-on-sync, interchange-format attach, E2EE content opacity; UC-60/61 |
 | 2026-06-14 | `260614-logseq-deep-dive/` | Logseq — block-graph on plain Markdown files, in-file block IDs, derived Datalog index; UC-62/63 |
 | 2026-06-14 | `260614-localfirst-workspaces-deep-dive/` | Anytype · AFFiNE · AppFlowy — CRDT local-first workspaces (any-sync/Yjs/Yrs), native merge, P2P/E2EE; UC-64/65 |