feat: renumber lib reference into 4-pillar anatomy

Renumber the 15 reference docs into pillar groups (recipe -> anatomy):
- 01 Build Recipe (entry), 02 Composition Root
- domains: 10 Layering Rules
- contract: 20 Spec-First Routing, 21 CRUD Template, 22 Auth Integration
- interfaces/infra: 30 Infra Adapters
- UI: 40 UI: Auto-Rendered Admin & Custom Pages (new; @aetoskia packages,
  client template, x- catalog via react-openapi MCP module)
- pipelines: 50 Pipeline Scaffold, 51 Worker & Progress, 52 Human-in-the-Loop
- delivery/meta: 90 Drone Pipelines, 91 Versioning & Changelog,
  92 Genericity Matrix, 93 Library Registry, 94 Repository Inventory

MCP module names are unchanged (NN_ prefix stripped); all cross-references
(wiki, templates, hooks, registry) updated; lib index rewritten pillar-first;
build recipe bootstraps the client template. Bundle + HTML sites regenerated.

standards/mcp/templates/app/pipelines/item_sync.py

@@ -5,7 +5,7 @@ Item-sync pipeline — the demo pipeline axis of the blueprint.
 Runs on the worker, consumes a pending job, and materializes its payload as an
 item. Steps are plain async functions here; once the chain branches or needs
 deterministic replay, wrap the steps in a dagpipe DAG (see standards
-"06_pipeline_scaffold").
+"50_pipeline_scaffold").
 """
 import logging
 

standards/mcp/templates/app/pipelines/shared/__init__.py

@@ -1,5 +1,5 @@
 """# Summary
 
 Shared pipeline scaffolding — ports, loader, and registry reused by every
-pipeline family. See standards "06_pipeline_scaffold".
+pipeline family. See standards "50_pipeline_scaffold".
 """