feat: add install_antigravity.ps1 for seamless agent-to-skill conversion

scripts/install_antigravity.ps1

@@ -0,0 +1,113 @@
+param(
+    [string]$RepoRoot = (Split-Path -Parent $PSScriptRoot),
+    [string]$DestDir = (Join-Path $HOME ".gemini/antigravity/skills"),
+    [switch]$DryRun
+)
+
+if ($DryRun) {
+    Write-Host "--- DRY RUN MODE ACTIVE ---" -ForegroundColor Yellow
+}
+
+
+$IntegrationsDir = Join-Path $RepoRoot "integrations\antigravity"
+$Today = Get-Date -Format "yyyy-MM-dd"
+
+$AgentDirs = @(
+    "academic", "design", "engineering", "game-development", "marketing", 
+    "paid-media", "sales", "product", "project-management", 
+    "testing", "support", "spatial-computing", "specialized", "strategy"
+)
+
+if ($IntegrationsDir -and -not (Test-Path $IntegrationsDir)) {
+    if ($DryRun) { Write-Host "[DryRun] Would create directory: $IntegrationsDir" }
+    else { New-Item -ItemType Directory -Path $IntegrationsDir -Force | Out-Null }
+}
+
+if ($DestDir -and -not (Test-Path $DestDir)) {
+    if ($DryRun) { Write-Host "[DryRun] Would create directory: $DestDir" }
+    else { New-Item -ItemType Directory -Path $DestDir -Force | Out-Null }
+}
+
+
+function Slugify($Name) {
+    $Slug = $Name.ToLower() -replace '[^a-z0-9]', '-'
+    $Slug = $Slug -replace '-+', '-'
+    $Slug = $Slug.Trim('-')
+    return "agency-$Slug"
+}
+
+$Count = 0
+
+foreach ($Dir in $AgentDirs) {
+    $DirPath = Join-Path $RepoRoot $Dir
+    if (-not (Test-Path $DirPath)) { continue }
+
+    $Files = Get-ChildItem -Path $DirPath -Filter "*.md"
+    foreach ($File in $Files) {
+        $Content = Get-Content -Path $File.FullName -Raw
+        if ($Content -match "^---\r?\n([\s\S]*?)\r?\n---\r?\n([\s\S]*)$") {
+            $FrontMatter = $Matches[1]
+            $Body = $Matches[2]
+
+            $Name = ""
+            $Description = ""
+
+            if ($FrontMatter -match "name:\s*(.*)") { $Name = $Matches[1].Trim() }
+            if ($FrontMatter -match "description:\s*(.*)") { $Description = $Matches[1].Trim() }
+
+            if ($Name -eq "") { continue }
+
+            $Slug = Slugify $Name
+            $SkillDir = Join-Path $IntegrationsDir $Slug
+            if (-not (Test-Path $SkillDir)) {
+                if ($DryRun) { Write-Host "[DryRun] Would create directory: $SkillDir" }
+                else { New-Item -ItemType Directory -Path $SkillDir -Force | Out-Null }
+            }
+
+            $NewContent = @"
+---
+name: $Slug
+description: $Description
+risk: low
+source: community
+date_added: '$Today'
+---
+$Body
+"@
+            $OutFile = Join-Path $SkillDir "SKILL.md"
+
+            if ($DryRun) {
+                Write-Host "[DryRun] Would write converted skill to: $OutFile"
+            }
+            else {
+                Set-Content -Path $OutFile -Value $NewContent -Encoding utf8
+            }
+
+            # Install to Antigravity skills dir
+            $InstallDir = Join-Path $DestDir $Slug
+            if (-not (Test-Path $InstallDir)) {
+                if ($DryRun) { Write-Host "[DryRun] Would create directory: $InstallDir" }
+                else { New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null }
+            }
+
+            if ($DryRun) {
+                Write-Host "[DryRun] Would copy skill to installation path: $(Join-Path $InstallDir "SKILL.md")"
+            }
+            else {
+                Copy-Item -Path $OutFile -Destination (Join-Path $InstallDir "SKILL.md") -Force
+            }
+
+
+            $Count++
+        }
+    }
+}
+
+if ($DryRun) {
+    Write-Host "Dry run complete. Found $Count agents to convert."
+}
+else {
+    Write-Host "Successfully converted and installed $Count agents as Antigravity skills."
+    Write-Host "Skills installed to: $DestDir"
+}
+