spec: CoreArchitectureBlueprint — whole-system architecture from research

The optimal architecture synthesised from INTENT + the full research arc:
- Thesis: canonical at the edges, derived in the middle (orchestrator not engine)
- Dual narrow waist: adapter contract (15 capability spectra) + page model
- 6 layers + provenance/capability rails; L4 union/projection is a rebuildable cache
- Federation-model taxonomy (plural/composable); two-axis projection model;
  moldable view registry; identity != placement; computational content in scope
  as page-model+projection, out as execution platform
- Concrete src/ module layout with downward-only dependency rule
- Canonical data flows; policy surface; tradeoffs; full traceability to INTENT/UCs
References ArchitectureBlueprint.md as the L5 authorization sub-blueprint.

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

SCOPE.md

@@ -21,7 +21,7 @@ Learnings update both SCOPE and INTENT where necessary.
 | Intent | `INTENT.md` established; authorization-in-core amendments drafted |
 | Research | yawex prior art; c2 origins; federation concepts; wikiengines overview (`research/260608-*/`); XWiki/TWiki/Foswiki deep dives (`research/260613-*/`); Xanadu + ZigZag + Roam + Obsidian + Notion + Joplin + Logseq + local-first workspaces (Anytype/AFFiNE/AppFlowy) + Trilium + Wiki.js + Federated Wiki + Wikibase + git-forge wikis + TiddlyWiki + ikiwiki + Quip + MojoMojo + Oddmuse + UseModWiki deep dives & shard-spectrum synthesis (`research/260614-*/`) |
 | Demand | NetKingdom integration asks captured, not yet negotiated |
-| Spec | Architecture blueprint drafted; UseCaseCatalog 84 UCs from research; PRD/TSD scaffolds |
+| Spec | CoreArchitectureBlueprint (whole-system architecture) + ArchitectureBlueprint (auth/history) drafted; UseCaseCatalog 84 UCs from research; PRD/TSD scaffolds |
 | Work | `SHARD-WP-0001` active (6 tasks); `SHARD-WP-0002` active (18 tasks: T1–T10 federation + T11–T16 adapter contract + T17 federation-model taxonomy + T18 computational content, re-folded from synthesis v3 + the computational page model); `SHARD-WP-0003` **done** (9 engine dives complete); `SHARD-WP-0004` **done** (all 8 computational-knowledge dives T1–T8 complete + "computational page model" synthesis) |
 
 ## In Scope (today)