card-truth: fix the 3 genuine card-lies (hoover / rave piano+break / ska guitar)

The promises gate named 3 remaining lies (NEXT.md 4b); all three are now KEPT and the catalog card-lie count is ZERO:

• 1. HOOVER as a SIGNATURE model (gabber + happyhardcore): the cards promise hoover stabs but "stack" was sampled away to a wind fallback.

• 2. happyhardcore's piano + breakbeat: lead pool now ["hoover" x3, "sampler"] with samplerPool ["bright_yamaha_grand"] (the '92 rave piano riff, 2/12 seeds measured) and a one-bar amen ROLL into every section…

• 3. ska's guitar skank: pads samplerPool ["clean_guitar" x2, "percussive_organ","rock_organ"] - the choppy offbeat comp layer is guitar-first (7/20 seeds draw it; the 2-tone organ keeps the rest).

Verified: verify.sh --no-cache fully green (matrix 228/228 diagonal dominant, gabber/happyhardcore/ska all 100* self; validate/engine/prove/matproof PASS).

▶ Play it: Jackhammer Communion → Serotonin Stampede — a shuttle between the two genres this change names — the blend is the point https://stellate.app/?genre=gabber&seed=3506&path=1809.17533,1992.10036&xdur=0.1

111a5d5 https://github.com/aboard-io/stellate/commit/111a5d5a64a4b80d20b901c043267ec954ae6197