Initial gwin-skill: Gowin ACG525 full toolchain skill for agents.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/build.ps1

@@ -0,0 +1,40 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$ProjectDir,
+    [string]$GowinRoot = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+if (-not $GowinRoot) {
+    $GowinRoot = Join-Path (Split-Path (Split-Path $PSScriptRoot -Parent) -Parent) `
+        "tool-chain\Gowin\Gowin_V1.9.11.03_Education_x64"
+    if (-not (Test-Path $GowinRoot)) {
+        $GowinRoot = "C:\Users\Administrator\Documents\fpga\tool-chain\Gowin\Gowin_V1.9.11.03_Education_x64"
+    }
+}
+
+$ProjectDir = (Resolve-Path $ProjectDir).Path
+$gwSh = Join-Path $GowinRoot "IDE\bin\gw_sh.exe"
+$buildTcl = Join-Path $ProjectDir "build.tcl"
+
+if (-not (Test-Path $gwSh)) { throw "gw_sh.exe not found: $gwSh" }
+if (-not (Test-Path $buildTcl)) { throw "build.tcl not found: $buildTcl" }
+
+$env:PATH = "$(Join-Path $GowinRoot 'IDE\bin');$(Join-Path $GowinRoot 'Programmer\bin');$env:PATH"
+
+Write-Host "Building: $ProjectDir"
+Push-Location $ProjectDir
+try {
+    cmd /c "type build.tcl | gw_sh.exe"
+    if ($LASTEXITCODE -ne 0) { throw "gw_sh failed with exit $LASTEXITCODE" }
+} finally {
+    Pop-Location
+}
+
+$fs = Get-ChildItem (Join-Path $ProjectDir "impl\pnr\*.fs") -ErrorAction SilentlyContinue |
+    Sort-Object LastWriteTime -Descending | Select-Object -First 1
+if (-not $fs) { throw "No bitstream (.fs) under impl\pnr" }
+
+Write-Host "OK bitstream: $($fs.FullName)"
+return $fs.FullName