- cache_service.delete_content: Remove user's ownership link first,
only delete actual file if no other owners remain
- cache_manager.discard_activity_outputs_only: Check if outputs and
intermediates are used by other activities before deleting
- run_service.discard_run: Now cleans up run outputs/intermediates
(only if not shared by other runs)
- home.py clear_user_data: Use ownership model for effects and media
deletion instead of directly deleting files
The ownership model ensures:
1. Multiple users can "own" the same cached content
2. Deleting removes the user's ownership link (item_types entry)
3. Actual files only deleted when no owners remain (garbage collection)
4. Shared intermediates between runs are preserved
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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