- Rename _get_tree_or_403 → _get_tree_or_404 in maintenance_schedules.py
(function now raises 404, old name was misleading)
- Restore HTTP 403 for intra-account permission failures in update_tree:
same-account users who can see a tree but can't edit it got 404 (wrong);
only cross-account lookups should return 404 to avoid confirming existence
- Apply same 403/404 distinction to update_tree_visibility
- Add test: get_documentation must return 404 for cross-user session access
- Add comment documenting owner-only design for documentation endpoints
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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