Address release approval review feedback

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d00747b7-96f3-4e7a-8dfb-e3a48db04b2d

Author: Copilot CI

.github/skills/release-readiness/references/methodology.md

@@ -148,9 +148,9 @@ Use the manual path when Arcade cannot apply the change cleanly. It is also avai
 For a normal automation conflict, use the source PR's **merge commit** — not its head-branch tip:
 
 ```bash
-git fetch origin
+git fetch <dotnet-maui-upstream-remote>
 git switch -c release-agent/backport-pr-<source-pr>-to-sr<N> \
-  origin/release/<major>.0.1xx-sr<N>
+  <dotnet-maui-upstream-remote>/release/<major>.0.1xx-sr<N>
 git cherry-pick -x <source-merge-sha>
 # Resolve any conflicts, then test the resolved behavior.
 git push -u <authenticated-user-fork-remote> HEAD

.github/skills/release-readiness/tests/Test-ReleaseAgentHumanApproval.ps1

@@ -160,6 +160,13 @@ try {
 }
 Assert-Equal 'malformed review data fails closed' $true $malformedFailedClosed
 
+$workflowPath = Join-Path $PSScriptRoot '../../../workflows/release-agent-human-approval.yml'
+$workflow = Get-Content -LiteralPath $workflowPath -Raw
+Assert-Equal 'workflow never creates the repository tracking label' $false `
+    $workflow.Contains('gh api --method POST "repos/$REPOSITORY/labels"')
+Assert-Equal 'workflow fails closed when the tracking label is missing' $true `
+    $workflow.Contains("::error::Required repository label '`$TRACKING_LABEL' is missing")
+
 Write-Host "`nPassed: $script:passed   Failed: $script:failed" `
     -ForegroundColor $(if ($script:failed -eq 0) { 'Green' } else { 'Red' })
 exit $(if ($script:failed -eq 0) { 0 } else { 1 })

.github/workflows/release-agent-human-approval.yml

@@ -66,12 +66,8 @@ jobs:
           fi
 
           if ! gh api "repos/$REPOSITORY/labels/$TRACKING_LABEL" >/dev/null 2>&1; then
-            gh api --method POST "repos/$REPOSITORY/labels" \
-              -f name="$TRACKING_LABEL" \
-              -f color="8250df" \
-              -f description="Durable provenance for release-agent human approval" \
-              >/dev/null 2>&1 ||
-              gh api "repos/$REPOSITORY/labels/$TRACKING_LABEL" >/dev/null
+            echo "::error::Required repository label '$TRACKING_LABEL' is missing; an administrator must pre-create it."
+            exit 1
           fi
 
           gh api --paginate \