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, 1 insertions, 0 deletions

diff --git a/tools/ark/gift-shot.js b/tools/ark/gift-shot.js
index 948854c..3ebb21f 100644
--- a/tools/ark/gift-shot.js
+++ b/tools/ark/gift-shot.js
@@ -17,6 +17,7 @@ for (let i = 0; i < 30; i++) { try { if ((await fetch(APP)).ok) break; } catch {
 
 const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox'] });
 const page = await browser.newPage();
+page.on('pageerror', (e) => console.log('[pageerror]', e.message));
 await page.setViewport({ width: 420, height: 860, deviceScaleFactor: 2 });
 const clickText = (sel, text) => page.evaluate((sel, text) => {
   const el = [...document.querySelectorAll(sel)].find((e) => e.textContent.trim().toLowerCase().includes(text.toLowerCase()));