Finishes the remaining #3 zap audit items.
- zapSplit: when the platform fee would pay the SAME Lightning address as the
creator (e.g. the creator is the platform operator), collapse to a single
full-amount payment instead of sending two invoices to one wallet — avoids an
extra routing fee and a confusing duplicate receipt for the same total.
- Audited split correctness: floor(amount*fee/100) with the creator taking the
remainder loses no sats; a sub-1-sat fee rounds to 0 and the whole zap goes to
the creator (no zero-amount platform send); fee is clamped 0–100 and a junk
override falls back to the default. The earlier "fee landed in my own wallet"
report is expected behavior (sender is the platform operator, or a self-zap),
not a bug.
- Cheat-resistant tests: testCreatorEqualsPlatformCollapsesToOnePayment and
testSplitRoundingPreservesEverySat in tests/zap-split.test.mjs.
- Receipt validation (9735) and NWC budget/retry UX confirmed already solid;
audit plan + TODO #3 closed.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
