Phase 3: Add FMOD modification guide and extraction script

- Added docs/FMOD_MODIFICATION_GUIDE_PHASE3.md with step-by-step FMOD Studio instructions
- Added tools/ExtractBanks.ps1 for automated bank extraction workflow
- Covers voice limits, ducking, enemy indicator improvements in FMOD

tools/ExtractBanks.ps1

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+# HomuraHime Audio Mod - Bank Extraction Script
+# Run this after installing AssetRipper to extract FMOD banks
+
+param(
+    [string]$GamePath = "C:\apps\steam\steamapps\common\Homura Hime",
+    [string]$OutputPath = "C:\projects\HomuraHime-Mods\extracted_assets",
+    [string]$BackupPath = "C:\projects\HomuraHime-Mods\backup_banks_original"
+)
+
+$ErrorActionPreference = "Stop"
+
+Write-Host "HomuraHime Audio Mod - Bank Extraction Script" -ForegroundColor Cyan
+Write-Host "=" * 50
+
+# Check if AssetRipper exists
+$AssetRipperPath = "C:\projects\HomuraHime-Mods\tools\AssetRipper\AssetRipper.exe"
+if (-not (Test-Path $AssetRipperPath)) {
+    Write-Host "[ERROR] AssetRipper not found at: $AssetRipperPath" -ForegroundColor Red
+    Write-Host "Please install AssetRipper first (see docs/SETUP_PHASE1.md)" -ForegroundColor Yellow
+    exit 1
+}
+
+# Check if game path exists
+$GameDataPath = Join-Path $GamePath "HomuraHime_Data\StreamingAssets\FMOD\Desktop"
+if (-not (Test-Path $GameDataPath)) {
+    Write-Host "[ERROR] Game FMOD banks not found at: $GameDataPath" -ForegroundColor Red
+    Write-Host "Please verify game installation" -ForegroundColor Yellow
+    exit 1
+}
+
+Write-Host "[INFO] Game path: $GameDataPath" -ForegroundColor Green
+
+# Create directories
+$OutputBanksPath = Join-Path $OutputPath "StreamingAssets\FMOD\Desktop"
+$BackupBanksPath = $BackupPath
+
+New-Item -ItemType Directory -Force -Path $OutputBanksPath | Out-Null
+New-Item -ItemType Directory -Force -Path $BackupBanksPath | Out-Null
+
+Write-Host "[INFO] Output path: $OutputBanksPath" -ForegroundColor Green
+Write-Host "[INFO] Backup path: $BackupBanksPath" -ForegroundColor Green
+
+# List current banks
+$banks = Get-ChildItem -Path $GameDataPath -Filter "*.bank"
+Write-Host "[INFO] Found $($banks.Count) FMOD bank files" -ForegroundColor Cyan
+
+# Step 1: Backup original banks
+Write-Host "`n[STEP 1] Backing up original banks..." -ForegroundColor Yellow
+foreach ($bank in $banks) {
+    $dest = Join-Path $BackupBanksPath $bank.Name
+    Copy-Item -Path $bank.FullName -Destination $dest -Force
+    Write-Host "  Backed up: $($bank.Name)" -ForegroundColor Gray
+}
+Write-Host "[OK] Original banks backed up" -ForegroundColor Green
+
+# Step 2: Launch AssetRipper for extraction
+Write-Host "`n[STEP 2] Launching AssetRipper..." -ForegroundColor Yellow
+Write-Host "  In AssetRipper:" -ForegroundColor Cyan
+Write-Host "    1. File -> Load -> Select HomuraHime_Data folder" -ForegroundColor Cyan
+Write-Host "    2. File -> Export -> Resources" -ForegroundColor Cyan
+Write-Host "    3. Export to: $OutputPath" -ForegroundColor Cyan
+Write-Host "    4. Wait for export to complete" -ForegroundColor Cyan
+Write-Host "    5. Close AssetRipper" -ForegroundColor Cyan
+
+Start-Process $AssetRipperPath
+Write-Host "`n[PAUSE] Press Enter when AssetRipper export is complete..." -ForegroundColor Yellow
+Read-Host
+
+# Step 3: Verify extraction
+$extractedBanksPath = Join-Path $OutputPath "StreamingAssets\FMOD\Desktop"
+if (Test-Path $extractedBanksPath) {
+    $extractedBanks = Get-ChildItem -Path $extractedBanksPath -Filter "*.bank"
+    Write-Host "[OK] Found $($extractedBanks.Count) extracted bank files" -ForegroundColor Green
+    
+    # List key banks
+    $keyBanks = @("SFX.bank", "Ambience.bank", "Master.bank", "Voice.bank")
+    foreach ($keyBank in $keyBanks) {
+        $found = $extractedBanks | Where-Object { $_.Name -eq $keyBank }
+        if ($found) {
+            Write-Host "  [OK] $keyBank found ($([math]::Round($found.Length / 1MB, 2)) MB)" -ForegroundColor Green
+        } else {
+            Write-Host "  [WARN] $keyBank not found" -ForegroundColor Yellow
+        }
+    }
+} else {
+    Write-Host "[ERROR] Extraction failed - path not found: $extractedBanksPath" -ForegroundColor Red
+    exit 1
+}
+
+# Summary
+Write-Host "`n" + "=" * 50
+Write-Host "Extraction Complete!" -ForegroundColor Cyan
+Write-Host ""
+Write-Host "Next steps:" -ForegroundColor Yellow
+Write-Host "  1. Open FMOD Studio 2.02.x" -ForegroundColor Cyan
+Write-Host "  2. Open banks from: $extractedBanksPath" -ForegroundColor Cyan
+Write-Host "  3. Edit banks for voice limits, ducking, enemy cues" -ForegroundColor Cyan
+Write-Host "  4. See docs/FMOD_MODIFICATION_GUIDE_PHASE3.md for details" -ForegroundColor Cyan
+Write-Host ""
+Write-Host "Current project structure:" -ForegroundColor Gray
+Write-Host "  extracted_assets\StreamingAssets\FMOD\Desktop\  <- Edit these banks" -ForegroundColor Gray
+Write-Host "  backup_banks_original\  <- Original banks (backup)" -ForegroundColor Gray
+Write-Host "  modified_banks\  <- Create this folder for modified banks" -ForegroundColor Gray