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* fix(invoices): book remaining_amount + emit invoice.paid on agent mark-paid path (#825) The agent/MCP commit path commitMarkInvoicePaid flipped status to 'paid' and set paid_amount = total but never wrote remaining_amount (left at the original total) and never emitted invoice.paid — so partial state and webhooks diverged from the dashboard and v1 mark-paid routes. Route the agent path through the shared planInvoicePayment helper (the source of truth introduced in #841): compute paid/remaining/status with the overpayment guard BEFORE booking the JE (so a rejected payment never burns a voucher number), persist remaining_amount + the partially_paid transition, and best-effort emit invoice.paid for webhook parity. Adds lib/pending-operations/__tests__/mark-invoice-paid.test.ts covering the state + event behaviour of this path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(invoices): address review feedback on agent mark-paid path (#825) - CAS-guard 409 message now reflects the expanded payable states: the UPDATE filter accepts partially_paid (reachable via a concurrent settle race), not just sent/overdue. - Derive the settle amount from total − paid_amount when remaining_amount is null (legacy rows) instead of falling back to the full total, so a prior partial payment is not double-counted into a false overpayment rejection. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(invoices): derive remaining from total − paid_amount on all mark-paid surfaces (#825) The dashboard and v1 mark-paid routes defaulted the settle amount to invoice.total when remaining_amount was null, which over-settles a legacy invoice that has a prior partial payment recorded in paid_amount (false overpayment / AR over-credit). Align both with the agent path (commit.ts): remaining_amount ?? total − paid_amount. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>