Many identity providers (AWS Cognito, Okta, Azure AD) reject or mishandle colons in OAuth scope names. This migrates all custom scopes from `resource:action` to `resource.action` format (e.g., `notes:read` → `notes.read`), which is universally accepted and aligns with industry conventions (Microsoft, Google). Includes Alembic migration 004 for stored scope strings and ADR-024 documenting the rationale and RFC references. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>