chore: enforce least-privilege permissions in GitHub Actions workflows

Set top-level `permissions: {}` on all workflows and move required
permissions to job level. Switch publish.yml from secrets.PAT to
secrets.GITHUB_TOKEN so semantic-release can comment on PRs/issues.

.github/workflows/codeql.yml

@@ -11,15 +11,15 @@ on:
     - cron: '30 1 * * 0' # Run at 1:30 AM UTC every Sunday
   merge_group:
 
-permissions:
-  actions: read
-  contents: read
+permissions: {}
 
 jobs:
   analyze:
     name: Analyze
     runs-on: ubuntu-latest
     permissions:
+      actions: read
+      contents: read
       security-events: write
 
     strategy:

.github/workflows/pr-lint.yml

@@ -6,6 +6,8 @@ on:
   pull_request:
     branches: [master, main]
 
+permissions: {}
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true

.github/workflows/publish.yml

@@ -6,7 +6,7 @@ on:
     branches:
       - main
 
-permissions: read-all
+permissions: {}
 
 env:
   NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
@@ -72,5 +72,5 @@ jobs:
       - name: Semantic Release
         uses: cycjimmy/semantic-release-action@b12c8f6015dc215fe37bc154d4ad456dd3833c90 # v6.0.0
         env:
-          GITHUB_TOKEN: ${{ secrets.PAT }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/stale.yml

@@ -8,10 +8,7 @@ on:
   workflow_call:
   workflow_dispatch:
 
-permissions:
-  contents: read
-  packages: read
-  statuses: read
+permissions: {}
 
 jobs:
   stale:

.github/workflows/sync-labels.yml

@@ -20,7 +20,7 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
-permissions: read-all
+permissions: {}
 
 jobs:
   labels:

.github/workflows/update-browserslist.yaml

@@ -7,13 +7,14 @@ on:
     - cron: '0 2 1,15 * *'
   workflow_dispatch:
 
-permissions:
-  contents: write
-  pull-requests: write
+permissions: {}
 
 jobs:
   update-browserslist-database:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2