V3 QuickBooks Online capability pack for the SMB-finance wedge. Declares canonical accounting operations over QuickBooks invoices, bills, expenses (Purchase), customer payments, refunds, customers, vendors, chart of accounts (Account), daily bookkeeping views, and financial reports. Reads flow after connection grant; invoice/bill/expense/customer/vendor writes ask + diff; customer-payment, refund, and invoice-void are destructive/always-ask so money movement never rides a session grant. Mirrors the shipped Stripe billing-pack entity_platform pattern. The READ surface is LIVE-VERIFIED against the QuickBooks Online sandbox (2026-06-13): OAuth token exchange, the /query endpoint (base https://quickbooks.api.intuit.com, /v3/company/<realmId>/query?query=<SQL>&minorversion=75 -> QueryResponse.<Entity>[]), single read-by-id (/<entity>/<id> -> {<Entity>}), realmId-in-path + sandbox base, and every read field_path all confirmed against live sandbox data. WRITE ops (create/update/void/payment/refund) are authored to the same documented v3 shapes but were NOT exercised live (non-mutating verification only). This is the QuickBooks catalog + money-write surface ONLY — the two vendor-agnostic accounting workflows (overdue-invoice-chase, accounting-daily-back-office) ship in the vendor-neutral `acct` pack (install it alongside this one for the workflows); their canonical `core.acct.*` read op-steps resolve against THIS vendor's catalog at run (dispatch-time), projecting QuickBooks' raw records to the canonical accounting fields. Canonical accounting op-steps are read-only; money writes ride the gated ingredient binding. See docs/unified-pack-exploration/smb-finance-wedge.spec.md.