Refactor with platform-specific constraints

scripts/powershell/common.ps1

@@ -0,0 +1,65 @@
+#!/usr/bin/env pwsh
+# Common PowerShell functions analogous to common.sh (moved to powershell/)
+
+function Get-RepoRoot {
+    git rev-parse --show-toplevel
+}
+
+function Get-CurrentBranch {
+    git rev-parse --abbrev-ref HEAD
+}
+
+function Test-FeatureBranch {
+    param([string]$Branch)
+    if ($Branch -notmatch '^[0-9]{3}-') {
+        Write-Output "ERROR: Not on a feature branch. Current branch: $Branch"
+        Write-Output "Feature branches should be named like: 001-feature-name"
+        return $false
+    }
+    return $true
+}
+
+function Get-FeatureDir {
+    param([string]$RepoRoot, [string]$Branch)
+    Join-Path $RepoRoot "specs/$Branch"
+}
+
+function Get-FeaturePathsEnv {
+    $repoRoot = Get-RepoRoot
+    $currentBranch = Get-CurrentBranch
+    $featureDir = Get-FeatureDir -RepoRoot $repoRoot -Branch $currentBranch
+    [PSCustomObject]@{
+        REPO_ROOT    = $repoRoot
+        CURRENT_BRANCH = $currentBranch
+        FEATURE_DIR  = $featureDir
+        FEATURE_SPEC = Join-Path $featureDir 'spec.md'
+        IMPL_PLAN    = Join-Path $featureDir 'plan.md'
+        TASKS        = Join-Path $featureDir 'tasks.md'
+        RESEARCH     = Join-Path $featureDir 'research.md'
+        DATA_MODEL   = Join-Path $featureDir 'data-model.md'
+        QUICKSTART   = Join-Path $featureDir 'quickstart.md'
+        CONTRACTS_DIR = Join-Path $featureDir 'contracts'
+    }
+}
+
+function Test-FileExists {
+    param([string]$Path, [string]$Description)
+    if (Test-Path -Path $Path -PathType Leaf) {
+        Write-Output "  ✓ $Description"
+        return $true
+    } else {
+        Write-Output "  ✗ $Description"
+        return $false
+    }
+}
+
+function Test-DirHasFiles {
+    param([string]$Path, [string]$Description)
+    if ((Test-Path -Path $Path -PathType Container) -and (Get-ChildItem -Path $Path -ErrorAction SilentlyContinue | Where-Object { -not $_.PSIsContainer } | Select-Object -First 1)) {
+        Write-Output "  ✓ $Description"
+        return $true
+    } else {
+        Write-Output "  ✗ $Description"
+        return $false
+    }
+}