chore: add codeowners and harden workflow permissions (#8)

Enterprise governance hardening:
- Add explicit /.github/ ownership to CODEOWNERS where missing.
- Add top-level least-privilege permissions (default contents: read)
  to workflows lacking one, granting only the scopes each needs.
- Add timeout-minutes to jobs missing one.
YAML hardening only; no build logic, scripts, or step contents changed.

Co-authored-by: Kim Harjamäki <kim.harjamaki@prosimo.fi>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: 3 people

.github/workflows/codeql.yml

@@ -4,10 +4,14 @@ on:
     branches: [ "main", "master" ]
   pull_request:
     branches: [ "main", "master" ]
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     permissions:
       actions: read
       contents: read

.github/workflows/pages.yml

@@ -14,6 +14,7 @@ concurrency:
 jobs:
   build:
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -29,6 +30,7 @@ jobs:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     needs: build
     steps:
       - name: Deploy to GitHub Pages

.github/workflows/pr-lint.yml

@@ -6,10 +6,15 @@ on:
       - edited
       - synchronize
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   main:
     name: Validate PR title
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     steps:
       - uses: amannn/action-semantic-pull-request@v5
         env:

.github/workflows/stale.yml

@@ -3,9 +3,15 @@ on:
   schedule:
   - cron: '0 0 * * *'
 
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
 jobs:
   stale:
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     steps:
     - uses: actions/stale@v8
       with: