docs: Add documentation system architecture

- Create DOCUMENTATION-SYSTEM-ARCHITECTURE.adoc describing
  the integration of formatrix-docs, recon-silly-ation,
  docubot, and docudactyl
- Update ECOSYSTEM.scm with related project relationships

The four components form a complete documentation lifecycle:
- Formatrix Docs: Human editor
- Recon-Silly-Ation: Machine reconciliation
- Docubot: LLM-powered generation
- Docudactyl: Orchestration layer

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

ECOSYSTEM.scm

@@ -11,7 +11,13 @@
    (position-in-ecosystem . "core-application")
 
    (related-projects
-     ((rhodium-standard . "sibling-standard")
+     ((recon-silly-ation . ((relationship . "consumer")
+                           (description . "Machine reconciliation of documents")))
+      (docubot . ((relationship . "assistant")
+                 (description . "LLM-powered doc generation")))
+      (docudactyl . ((relationship . "orchestrator")
+                    (description . "Workflow coordination")))
+      (rhodium-standard . "sibling-standard")
       (gitvisor . "infrastructure")
       (mustfile . "build-system")
       (nickel . "configuration")))