Preview storage preset

Bounded explicit same-owner raw content reconciliation of one existing collection, same stable slot IDs, no copied manifest/configuration change. Version 4 is the only command version: it carries the exact current copied manifest, per-slot origins and slotOrder.before/after (identical, or a permutation that also advances the layout revision). Content and origins bind by ID; slot versions advance. At most 1025 slots/manifest entries, 2050 distinct raw-copy refs, 100 wants/slot, 8192 work units (2S+I+W) and 1.75 MiB UTF-8/JSONB command text plus a 2.5 MiB complete prospective audit/undo graph. SQL independently refuses oversized graphs before writes with invalid_input, never a terminal rejection proof. Other command versions return invalid_input. Receipts and dedicated rejections carry version:4. These bounds do not establish production full-Dex availability. Current actor/owner/session or credential and partner preconditions are required, file IDs never prove provenance. Exact item/slot/placement/content/layout versions bind review. Explicit releases retain ownership in Unassigned; copies placed elsewhere cannot move. SQL checks the complete actual graph and its undo before commit. No acquisition, metadata replacement, graded copies, structural slot-set/configuration/grid, multi-collection/settings/assets/CSV restore. Lifetime exact accepted/rejected replay precedes mutable reconstruction after current authority checks. Only committed dedicated inventory/collection/content predicate rejection yields REST409 storage_restore_rejected or MCP isError with error.rejection. MCP outputSchema describes accepted receipts only; holofolder.com/errorSchemas declares errors. Arbitrary conflicts, cancellation and failed COMMIT remain unknown; retain original intent and require a fresh complete read plus explicit reconciliation. Required permissions: `collection:write`, `binders:write`. MCP tool: `restore_raw_collection_content`.