feat: professional reggaeton production engine — 7 SDD changes, 302 tests

- section-energy: track activity matrix + volume/velocity multipliers per section
- smart-chords: ChordEngine with voice leading, inversions, 4 emotion modes
- hook-melody: melody engine with hook/stabs/smooth styles, call-and-response
- mix-calibration: Calibrator module (LUFS volumes, HPF/LPF, stereo, sends, master)
- transitions-fx: FX track with risers/impacts/sweeps at section boundaries
- sidechain: MIDI CC11 bass ducking on kick hits via DrumLoopAnalyzer
- presets-pack: role-aware plugin presets (Serum/Decapitator/Omnisphere per role)

Full SDD pipeline (propose→spec→design→tasks→apply→verify) for all 7 changes.
302/302 tests passing.

scripts/_match_samples.py

@@ -0,0 +1,49 @@
+import json, hashlib, os
+
+# Load our sample index
+idx = json.load(open('data/sample_index.json'))
+samples = idx['samples']
+
+# Build MD5 → sample map
+md5_map = {}
+for s in samples:
+    h = s.get('file_hash', '')
+    if h:
+        md5_map[h] = s
+
+# Ableton drumloop paths
+ableton_dir = r"C:\ProgramData\Ableton\Live 12 Suite\Resources\MIDI Remote Scripts\libreria\reggaeton\drumloops"
+ableton_samples = [
+    "100bpm filtrado drumloop.wav",
+    "90bpm reggaeton antiguo drumloop.wav",
+    "94bpm reggaeton antiguo 2 drumloop.wav",
+    "100bpm_gata-only_drumloop.wav",
+    "98bpm yera drumloop.wav",
+    "98bpm nachogflow drumloop.wav",
+    "90bpm reggaeton antiguo 3 drumloop.wav",
+]
+
+print("Matching Ableton samples to our library:\n")
+for name in ableton_samples:
+    path = os.path.join(ableton_dir, name)
+    if not os.path.exists(path):
+        print(f"  NOT FOUND: {name}")
+        continue
+    
+    # Compute MD5
+    h = hashlib.md5()
+    with open(path, 'rb') as f:
+        for chunk in iter(lambda: f.read(8192), b''):
+            h.update(chunk)
+    md5 = h.hexdigest()
+    
+    # Lookup in index
+    match = md5_map.get(md5)
+    if match:
+        print(f"  {name}")
+        print(f"    -> {match['original_name']}")
+        print(f"    MD5: {md5}")
+        print(f"    Path: {match['original_path']}")
+    else:
+        print(f"  {name} -> NO MATCH (md5={md5})")
+    print()