Card-truth wave: the orphans get wired, the gavel stops stuttering

The card-truth sweep found a whole cast of registered-but-unwired samples — cards promising an auctioneer, a modem, an umpire, whose audio existed and played for no one.

• THE LIVE CADENCE AMPLIFIER (foundation). stepWalk feeds the engine a ONE-SECTION, one-cycle song per chord-bar, so buildEvents' sampleEvents pass saw every bar as both the first section (opener) and a section…

• sp_auction_1/2/3 -> auctioncore. "the auctioneer chant IS the genre," but the three speech clips were wired to nothing.

• modem_handshake -> dialupgabber. Root cause was url:"" — found/modem_handshake .mp3 was on disk but unfetchable, so the "screaming modem negotiation" the card sells never played.

Verified: matrix 228/228 --no-cache, verify.sh (validate + engine + prove) green, musicality green, explorer-ui + access-ui green, auctioncore/dialupgabber/ microwave live-render clean with zero…

▶ Play it: Going Going Gone → Magnetron Benediction → Carrier Lost — the three genres this change names, as one path https://stellate.app/?genre=auctioncore&seed=2010&path=1647.15288,1276.5376,1423.11686&xdur=0.076

dfff27b https://github.com/aboard-io/stellate/commit/dfff27b246e947f9ad0123f617aae7e878dc7c2e