Card-truth wave: the silent sources find their voice (12 urls restored)

The modem was not alone. Twelve SOURCES carried url:"" while their generated audio sat on disk as found/.mp3 — so the found-player fetched "" and got silence.

• Restore all twelve urls to their disk files: crt_whine, floppy_seek, hvac_hum, fax_tone, dryer_spin, chickadee, pigeon_coo, dw_cycle, ferment_bubble, crickets, hydrophone, whale_song.

• Two were also unwired entirely, and the bpm-matched `break` role silently drops a texture clip (no bpm to match), so a naive found.sources add is inert.

• Two honest notes, both in NEXT.md: (1) ~15 genres just gained their intended ambient beds — the matrix guards identity but only Paul's ear can say none sit too loud.

Verified: matrix 228/228 --no-cache, verify.sh (validate + engine + prove) green, affected genres (faxbossa, crtwave, thermostatwave, whalejazz, crickettempo, floppycore, laundrycore) live-render…

▶ Play it: Abort Retry Fail → Unbalanced Load → Stationary Weather — the three genres this change names, as one path https://stellate.app/?genre=floppycore&seed=5433&path=1681.19828,1556.19248,2103.13302&xdur=0.114

d31cb31 https://github.com/aboard-io/stellate/commit/d31cb31931fb8bd5275eaedd53ef12ff2e46d790