* fix(invoices): reject overpayment on all invoice-match paths (audit C3)
The paid/remaining math was copy-pasted across three sites; the dashboard match-invoice route guarded against overpayment but the v1 public API route and the agent/MCP commitMatchTransactionInvoice had drifted WITHOUT it — silently accepting payment > remaining (recording paid_amount > total, over-crediting AR; cleanup needs storno, not edit).
- New lib/invoices/apply-invoice-payment.ts planInvoicePayment(): single source of the paid/remaining/status math + overpayment guard, via canonical roundOre (@/lib/money, guard rail #9). FX-agnostic — caller passes the invoice-currency amount.
- All three sites delegate; the guard runs BEFORE journal-entry creation so a rejected match never burns a voucher number. Dashboard behaviour unchanged (faithful extraction — its existing overpayment test still passes, the equivalence anchor). v1 returns MATCH_AMOUNT_EXCEEDS_REMAINING; commit returns the same registry message at 400.
- Removes 7 hand-rolled Math.round(x*100)/100 sites; antipattern guard ratchets 668 -> 661.
- Unit tests for the helper (overpayment rejection, half-öre tolerance, remaining_amount fallback).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* review: run overpayment guard before the storno (PR #647)
greptile: in commit.ts and the v1 route the conflicting-JE storno ran BEFORE the new guard, so a rejected overpayment would still reverse the transaction's prior JE and null its journal_entry_id — a side effect on a rejected match. Move planInvoicePayment above the storno so a rejection leaves the transaction fully untouched. (The dashboard route's pre-existing storno-before-guard ordering is FX-entangled and unchanged here; noted as a follow-up.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jakob Wennberg
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