Reorganize documentation into canonical repository layout

Adopt CoulombSocial/HelixForge/MarkiTect documentation structure:
- research/260608-yawex-prior-art/ — yawex exploration and sources
- demand/ — inbound NetKingdom integration requirements
- spec/ — PRD, TSD, UseCaseCatalog, ArchitectureBlueprint scaffolds
- docs/ — stakeholder documentation and repository-layout guide
- wiki/, issues/, history/ — scaffolded directories

Add SCOPE.md and AGENTS.md. Update workplan paths and README.

research/260608-yawex-prior-art/README.md

@@ -0,0 +1,19 @@
+# 260608 — yawex prior art exploration
+
+Date: 2026-06-08
+
+## What this is
+
+Review of **yawex 0.7.4** (2004–05 filesystem-backed CGI/Perl wiki engine) as
+prior art for `shard-wiki` federation design.
+
+## Contents
+
+| Path | Role |
+|------|------|
+| `findings.md` | Distilled KEEP / TRANSFORM / DROP analysis and open questions |
+| `sources/yawex-0.7.4/` | Original prior-art tree (Perl engine, pages, templates) |
+
+## Status
+
+Exploration complete. Design tasks tracked in `workplans/SHARD-WP-0001`.