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Task 20 of Phase 0: document the sub-module split. - fusion_accounting_core: foundation doc covering security groups, shared-field schema preservation, and the Enterprise-detection helper. - fusion_accounting_ai: preserves the original module's AI-specific design decisions, Odoo 19 gotchas, deployment commands, controllers, models, theme rules, and known issues. Adds a new Data-adapter pattern section documenting tri-mode routing (fusion / enterprise / community). - fusion_accounting_migration: doc for the Enterprise uninstall safety guard and the wizard shell that future feature sub-modules will extend. - fusion_accounting (meta): rewritten CLAUDE.md as a pure overview pointing at sub-modules, plus a new README.md covering one-click install/uninstall. Each sub-module now has CLAUDE.md (Cursor/Claude context), UPGRADE_NOTES.md (version-by-version deltas / reference sources), and README.md (user-facing install/usage docs). 11 files total. Made-with: Cursor