quotecloud_validate_quote

Run the aggregate, read-only QuoteCloud preflight over the document content in either storage model: pricing rows, merge/custom data (including live owner and recipient system fields), reachable recipients and signers, margin coverage, PDF readiness, and workflow requirements. Reports `contentMode` (`fine_grained` or `data_file_blob`) so a clean result is never mistaken for an unread document; if a data_file_blob cannot be read, `dataFileBlobStatus` and a matching blocking error say why and the document is not reported valid. The document summary explains that status `creating` is the normal editable, unsent-draft state, not an in-progress MCP operation. Detached blocks are warnings. Requires documents:validate; no side effects.

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