ci(auto-merge): hand the sweep a PAT so workflow PRs stop stalling

.github/workflows/auto-merge.yml

@@ -37,3 +37,19 @@ jobs:
       ci_workflow: ci.yml
       # SPACE-separated: the sweep word-splits this.
       rearm_workflows: 'ci.yml publish.yml'
+    secrets:
+      # GITHUB_TOKEN cannot merge a PR that touches .github/workflows, so every
+      # Dependabot `github_actions` bump stalls forever: the sweep tries, the
+      # merge API refuses, it logs "leaving for the next sweep", and repeats —
+      # while still exiting 0. ai-kit #11 sat green for nine days that way, and
+      # aoz-housing #122 for nine more.
+      #
+      # A PAT also makes the queue drain at CI speed rather than at the
+      # schedule's. A dispatch made with GITHUB_TOKEN emits no workflow_run, so
+      # after each merge nothing wakes the sweep for the next PR until the cron
+      # fires — and GitHub throttles that to roughly hourly whatever the cron
+      # says. A PAT-created dispatch does emit it.
+      #
+      # Undefined resolves to empty and the reusable workflow falls back to
+      # github.token, so this line is inert until the org secret exists.
+      token: ${{ secrets.FLEET_PAT }}