Add 2026-04 deltas (v2.1.83-v2.1.111) verified against
research/03-claude-code-changes-config-surfaces.md (2026-04-19):
- Opus 4.7 + token-efficiency surfaces (env vars, attribution.commit/pr)
- Sandbox isolation (sandbox.* keys)
- Managed-only enterprise lockdown flags
- disableSkillShellExecution (v2.1.91)
- forceRemoteSettingsRefresh (v2.1.92)
No new hook events in this range — noted in hook-events-reference.md.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>