dual-claude-json-config-parity-required-for-root-sessions

Claude Code has two .claude.json files: /home/claude/.claude.json (read by claude-user session) and /root/.claude.json (root-user mirror). Both must stay byte-for-byte identical — zero divergence. Any MCP server registration, transport change, or config mutation must be applied to both files in the same operation. Verified equality by diff after every mutation.