[eric] remove vendored 9router (now fetched from npm at build), remove Copilot, and fix subs + tools

scripts/fetch-router.ps1

@@ -0,0 +1,36 @@
+param(
+    [Parameter(Mandatory=$true)]
+    [string]$Dest
+)
+
+$ErrorActionPreference = 'Stop'
+
+$RouterVersion = if ($env:ROUTER_VERSION) { $env:ROUTER_VERSION } else { '0.3.60' }
+
+Write-Host "Fetching 9router@$RouterVersion from npm..."
+
+$Scratch = New-Item -ItemType Directory -Path (Join-Path $env:TEMP "9router-fetch-$([guid]::NewGuid())")
+try {
+    Push-Location $Scratch
+    '{"name":"_fetch","version":"0.0.0","private":true}' | Out-File -Encoding utf8 -NoNewline package.json
+    & npm install "9router@$RouterVersion" --no-save --no-audit --no-fund --silent --ignore-scripts
+    if ($LASTEXITCODE -ne 0) { throw "npm install 9router@$RouterVersion failed" }
+
+    $Src = Join-Path $Scratch 'node_modules\9router\app'
+    if (-not (Test-Path $Src)) {
+        throw "9router@$RouterVersion did not install to expected layout ($Src missing)"
+    }
+
+    Pop-Location
+
+    if (Test-Path $Dest) { Remove-Item -Recurse -Force $Dest }
+    New-Item -ItemType Directory -Force -Path $Dest | Out-Null
+
+    robocopy $Src $Dest /E /NJH /NJS /NDL /NFL /NP /MT:8 | Out-Null
+    if ($LASTEXITCODE -ge 8) { throw "robocopy failed staging 9router (exit $LASTEXITCODE)" }
+    $global:LASTEXITCODE = 0
+
+    Write-Host "9router staged at: $Dest"
+} finally {
+    if (Test-Path $Scratch) { Remove-Item -Recurse -Force $Scratch }
+}