feat(nam): download 10 new A2 models for bass, orange, and other missing categories

Bank 7 — Bass: Ampeg PF20T, Aguilar Tone Hammer 500, GK 800RB (Gallien-Krueger), Aguilar DB751
Bank 7 — Orange: Orange Rocker 30 Dirty + Natural
Bank 7 — Others: Fender Bassman dimed, Hiwatt DR103 Bright + Cornish, Supro Black Magick M3

All SlimmableContainer v0.7.0, ~287-295 KB, verified JSON.
Also fixed Bank 2 Tone3000 storage keys to include .nam extension (Tone3000 changed URL format).
Inventory updated: 54 → 64 total models.

src/dsp/pipeline.py

@@ -1040,7 +1040,7 @@ class AudioPipeline:
             zi = state.get("bd2_tshelf_zi", np.zeros(2, dtype=np.float64))
             sig, zf = lfilter(b, a, stage2.astype(np.float64, copy=False), zi=zi)
             state["bd2_tshelf_zi"] = zf
-            stage2 = sig.astype(np.float32)
+            stage2 = np.clip(sig, -1.0, 1.0).astype(np.float32)
 
         # Output level
         out = np.clip(stage2 * gain, -1.0, 1.0)
@@ -1130,7 +1130,7 @@ class AudioPipeline:
             sig, zf = lfilter(b, a, sig, zi=zi)
             state["muff_treb_zi"] = zf
 
-        out = np.clip(sig.astype(np.float32) * volume, -1.0, 1.0)
+        out = np.clip(np.clip(sig, -1.0, 1.0).astype(np.float32) * volume, -1.0, 1.0)
         return out
 
     # ── 4. Three-band EQ ────────────────────────────────────────────