fix: address Copilot review - fetch before branch check, PSBoundParameters

- Use $PSBoundParameters.ContainsKey('Number') for idiomatic explicit
  parameter detection (replaces sentinel approach); revert default to 0
- Add git fetch --all --prune before branch conflict check in both
  Bash and PowerShell so we don't miss remote-only branches
- Restructure Bash branch check into explicit if block for clarity

Author: daniel-graham

scripts/bash/create-new-feature.sh

@@ -283,8 +283,12 @@ if [ "$NUMBER_EXPLICIT" = true ]; then
 
     # Check for conflict in git branches (local and remote)
     BRANCH_CONFLICT=false
-    if [ "$HAS_GIT" = true ] && git branch -a 2>/dev/null | grep -qE "(^|[[:space:]])(remotes/[^/]+/)?${FEATURE_NUM}-"; then
-        BRANCH_CONFLICT=true
+    if [ "$HAS_GIT" = true ]; then
+        # Fetch remotes so we don't miss branches that exist only on remotes
+        git fetch --all --prune >/dev/null 2>&1 || true
+        if git branch -a 2>/dev/null | grep -qE "(^|[[:space:]])(remotes/[^/]+/)?${FEATURE_NUM}-"; then
+            BRANCH_CONFLICT=true
+        fi
     fi
 
     if [ "$SPEC_CONFLICT" = true ] || [ "$BRANCH_CONFLICT" = true ]; then

scripts/powershell/create-new-feature.ps1

@@ -4,7 +4,7 @@
 param(
     [switch]$Json,
     [string]$ShortName,
-    [int]$Number = -1,
+    [int]$Number = 0,
     [switch]$Help,
     [Parameter(ValueFromRemainingArguments = $true)]
     [string[]]$FeatureDescription
@@ -215,8 +215,8 @@ if ($ShortName) {
 # Determine branch number
 # Track whether the caller explicitly passed -Number so the guardrail below
 # only fires for explicit overrides, not for auto-detected numbers.
-$numberExplicit = ($Number -ge 0)
-if ($Number -lt 0) {
+$numberExplicit = $PSBoundParameters.ContainsKey('Number')
+if ($Number -eq 0) {
     if ($hasGit) {
         # Check existing branches on remotes
         $Number = Get-NextBranchNumber -SpecsDir $specsDir
@@ -243,6 +243,8 @@ if ($numberExplicit) {
     # Check for conflict in git branches (local and remote)
     $branchConflict = $false
     if ($hasGit) {
+        # Fetch remotes so we don't miss branches that exist only on remotes
+        try { git fetch --all --prune 2>$null | Out-Null } catch { }
         $allBranches = git branch -a 2>$null
         if ($LASTEXITCODE -eq 0) {
             $branchConflict = ($allBranches | Where-Object { $_ -match "(^|\s)(remotes/[^/]+/)?$featureNum-" }).Count -gt 0