Features phase 2: gift/swap/ark primitives leave the core wallet

wallet.js drops from 2,762 to 2,374 lines and now exposes two generic
seams instead of feature code:
- registerCoinLock()/lockedCoinIds(): features contribute coin ids that
  spending and the balance treat as unavailable (gift reservations).
- loadFeatureState()/saveFeatureState(): namespaced per-wallet persisted
  state.

src/features/gifts-wallet.js takes the whole gift engine — reservation
sets, gift records, coin selection, the SIGHASH_SINGLE/NONE PSBT
builder, the compact codec, claim building, nostr-locked gifts — as an
installGiftWallet(wallet) instance install plus standalone exports.
Swap storage/key helpers (loadSwaps/saveSwaps/swapNode/nextSwapIndex)
install from swap.js; ark state storage installs from the ark feature.
The silent-payment scan worker only embeds when the sp feature ships
(wallet.js already tolerated its absence).

Minimal profile: 412KB, down from 476KB (full: 578KB). All suites pass:
ark UI e2e, ArkManager crash-resume, gift lifecycle, minimal smoke.

SP's engine (scanning, BIP-352 signing) stays in wallet.js — extracting
it safely wants an SP e2e harness on this stack first.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01QFAcD4V284DvYZZHP7Rxxy

1 files changed, 2 insertions, 1 deletions

diff --git a/src/features/swaps.js b/src/features/swaps.js
index 636a9f8..b41b87a 100644
--- a/src/features/swaps.js
+++ b/src/features/swaps.js
@@ -2,7 +2,7 @@
 // pay bolt11 invoices, provider settings. Extracted from app.js; the
 // protocol layer lives in ../swap.js.
 
-import { SwapManager } from '../swap.js';
+import { SwapManager, installSwapWallet } from '../swap.js';
 import { getNetwork, getBoltzApi, BOLTZ_PRESETS, getBoltzProviderId, setBoltzProviderId, getBoltzCustom, setBoltzCustom } from '../api.js';
 import { t } from '../i18n.js';
 import { qrSvg } from '../qr.js';
@@ -13,6 +13,7 @@ function isLnInvoice(v) { v = (v || '').trim(); return /^ln[a-z0-9]+$/i.test(v)
 
 export function swapsFeature(ctx) {
   const { h, ui, render, wallet, blankSend, fmtAmount, unitLabel, copyBtn } = ctx;
+  installSwapWallet(wallet); // swap storage/keys live outside the core wallet
 
   // Boltz swap orchestrator (reverse = receive over LN, submarine = spend over LN).
   const swaps = new SwapManager({