fix(scripts): prioritize .specify over git for repo root detection (#1933)

* fix(scripts): prioritize .specify over git for repo root detection

When spec-kit is initialized in a subdirectory that doesn't have its
own .git, but a parent directory does, spec-kit was incorrectly using
the parent's git repository root. This caused specs to be created in
the wrong location.

The fix changes repo root detection to prioritize .specify directory
over git rev-parse, ensuring spec-kit respects its own initialization
boundary rather than inheriting a parent git repo.

Fixes #1932

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: address code review feedback

- Normalize paths in find_specify_root to prevent infinite loop with relative paths
- Use -PathType Container in PowerShell to only match .specify directories
- Improve has_git/Test-HasGit to check git command availability and validate work tree
- Handle git worktrees/submodules where .git can be a file
- Remove dead fallback code in create-new-feature scripts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: check .specify before termination in find_specify_root

Fixes edge case where project root is at filesystem root (common in
containers). The loop now checks for .specify before checking the
termination condition.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: scope git operations to spec-kit root & remove unused helpers

- get_current_branch now uses has_git check and runs git with -C to
  prevent using parent git repo branch names in .specify-only projects
- Same fix applied to PowerShell Get-CurrentBranch
- Removed unused find_repo_root() from create-new-feature.sh
- Removed unused Find-RepositoryRoot from create-new-feature.ps1

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: use cd -- to handle paths starting with dash

Prevents cd from interpreting directory names like -P or -L as options.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: check git command exists before calling get_repo_root in has_git

Avoids unnecessary work when git isn't installed since get_repo_root
may internally call git rev-parse.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(powershell): use LiteralPath and check git before Get-RepoRoot

- Use -LiteralPath in Find-SpecifyRoot to handle paths with wildcard
  characters ([, ], *, ?)
- Check Get-Command git before calling Get-RepoRoot in Test-HasGit to
  avoid unnecessary work when git isn't installed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(powershell): use LiteralPath for .git check in Test-HasGit

Prevents Test-Path from treating wildcard characters in paths as globs.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(powershell): use LiteralPath in Get-RepoRoot fallback

Prevents Resolve-Path from treating wildcard characters as patterns.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: iamaeroplane <michal.bachorik@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

scripts/powershell/create-new-feature.ps1

@@ -45,30 +45,6 @@ if ([string]::IsNullOrWhiteSpace($featureDesc)) {
     exit 1
 }
 
-# Resolve repository root. Prefer git information when available, but fall back
-# to searching for repository markers so the workflow still functions in repositories that
-# were initialized with --no-git.
-function Find-RepositoryRoot {
-    param(
-        [string]$StartDir,
-        [string[]]$Markers = @('.git', '.specify')
-    )
-    $current = Resolve-Path $StartDir
-    while ($true) {
-        foreach ($marker in $Markers) {
-            if (Test-Path (Join-Path $current $marker)) {
-                return $current
-            }
-        }
-        $parent = Split-Path $current -Parent
-        if ($parent -eq $current) {
-            # Reached filesystem root without finding markers
-            return $null
-        }
-        $current = $parent
-    }
-}
-
 function Get-HighestNumberFromSpecs {
     param([string]$SpecsDir)
     
@@ -139,26 +115,14 @@ function ConvertTo-CleanBranchName {
     
     return $Name.ToLower() -replace '[^a-z0-9]', '-' -replace '-{2,}', '-' -replace '^-', '' -replace '-$', ''
 }
-$fallbackRoot = (Find-RepositoryRoot -StartDir $PSScriptRoot)
-if (-not $fallbackRoot) {
-    Write-Error "Error: Could not determine repository root. Please run this script from within the repository."
-    exit 1
-}
-
-# Load common functions (includes Resolve-Template)
+# Load common functions (includes Get-RepoRoot, Test-HasGit, Resolve-Template)
 . "$PSScriptRoot/common.ps1"
 
-try {
-    $repoRoot = git rev-parse --show-toplevel 2>$null
-    if ($LASTEXITCODE -eq 0) {
-        $hasGit = $true
-    } else {
-        throw "Git not available"
-    }
-} catch {
-    $repoRoot = $fallbackRoot
-    $hasGit = $false
-}
+# Use common.ps1 functions which prioritize .specify over git
+$repoRoot = Get-RepoRoot
+
+# Check if git is available at this repo root (not a parent)
+$hasGit = Test-HasGit
 
 Set-Location $repoRoot