fix: remove duplicate SCM files from root

Per RSR policy, SCM files belong in .machine_readable/ ONLY.
Removed stale duplicates from root directory.

Files removed: STATE.scm META.scm ECOSYSTEM.scm AGENTIC.scm NEUROSYM.scm PLAYBOOK.scm

Refs: AI Gatekeeper Protocol, RSR Bronze standard
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell