param(
    [string]$Snapshot = "backtest_snapshots\prod.sqlite",
    [string]$Python = ".venv\Scripts\python.exe",
    [int]$Workers = 7
)

$ErrorActionPreference = "Stop"
$arms = @(
    "production_control",
    "rr_aligned_control",
    "rewrite",
    "soft_zones",
    "confirmed_rounds",
    "gate_v2"
)

foreach ($arm in $arms) {
    $output = "reports\backtest-sr-v2-train-$arm.json"
    Write-Host "Running S/R training arm: $arm"
    & $Python scripts\run_backtest_snapshot.py $Snapshot `
        --workers $Workers `
        --allow-spawn `
        --sr-variant $arm `
        --entry-end 2024-06-30 `
        --sr-audit `
        --out $output
    if ($LASTEXITCODE -ne 0) {
        throw "S/R training arm failed: $arm"
    }
}

Write-Host "Training matrix complete. Lock one arm before running validation."