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.

.gga

@@ -0,0 +1,50 @@
+# Gentleman Guardian Angel Configuration
+# https://github.com/your-org/gga
+
+# AI Provider (required)
+# Options: claude, gemini, codex, opencode, ollama:<model>, lmstudio[:model], github:<model>
+# Examples:
+#   PROVIDER="claude"
+#   PROVIDER="gemini"
+#   PROVIDER="codex"
+#   PROVIDER="opencode"
+#   PROVIDER="opencode:anthropic/claude-opus-4-5"
+#   PROVIDER="ollama:llama3.2"
+#   PROVIDER="ollama:codellama"
+#   PROVIDER="lmstudio"
+#   PROVIDER="lmstudio:qwen2.5-coder-7b-instruct"
+#   PROVIDER="github:gpt-4o"
+#   PROVIDER="github:deepseek-r1"
+PROVIDER="claude"
+
+# File patterns to include in review (comma-separated)
+# Default: * (all files)
+# Examples:
+#   FILE_PATTERNS="*.ts,*.tsx"
+#   FILE_PATTERNS="*.py"
+#   FILE_PATTERNS="*.go,*.mod"
+FILE_PATTERNS="*.ts,*.tsx,*.js,*.jsx"
+
+# File patterns to exclude from review (comma-separated)
+# Default: none
+# Examples:
+#   EXCLUDE_PATTERNS="*.test.ts,*.spec.ts"
+#   EXCLUDE_PATTERNS="*_test.go,*.mock.ts"
+EXCLUDE_PATTERNS="*.test.ts,*.spec.ts,*.test.tsx,*.spec.tsx,*.d.ts"
+
+# File containing code review rules
+# Default: AGENTS.md
+RULES_FILE="AGENTS.md"
+
+# Strict mode: fail if AI response is ambiguous
+# Default: true
+STRICT_MODE="true"
+
+# Timeout in seconds for AI provider response
+# Default: 300 (5 minutes)
+# Increase for large changesets or slow connections
+TIMEOUT="300"
+
+# Base branch for --pr-mode (auto-detects main/master/develop if empty)
+# Default: auto-detect
+# PR_BASE_BRANCH="main"