fix(ci): harden branch-cleanup.yml against Actions injection (sync from Template-Generic)

Claude-Session: https://claude.ai/code/session_01DQEMmJPe61ya7HDfA6BHP8

.mokogit/workflows/branch-cleanup.yml

@@ -5,7 +5,7 @@
 # FILE INFORMATION
 # DEFGROUP: MokoGIT.Workflow
 # INGROUP: MokoCLI.Universal
-# REPO: https://git.mokoconsulting.tech/MokoConsulting/mokocli
+# REPO: https://git.mokoconsulting.tech/MokoConsulting/Template-Generic
 # PATH: /.mokogit/workflows/branch-cleanup.yml
 # VERSION: 01.00.00
 # BRIEF: Delete feature branches after PR merge
@@ -30,14 +30,25 @@ jobs:
 
     steps:
       - name: Delete source branch
+        # SECURITY: the PR head ref is attacker-controllable. Pass it (and the
+        # repo/token) through env so the Actions engine cannot splice it into the
+        # shell source, and validate it to a safe charset before use.
+        env:
+          MOKOGIT_TOKEN: ${{ secrets.MOKOGIT_TOKEN }}
+          REPO: ${{ github.repository }}
+          API_BASE: ${{ vars.GITEA_URL || 'https://git.mokoconsulting.tech' }}
+          BRANCH: ${{ github.event.pull_request.head.ref }}
         run: |
-          BRANCH="${{ github.event.pull_request.head.ref }}"
-          API="${{ vars.GITEA_URL || 'https://git.mokoconsulting.tech' }}/api/v1/repos/${{ github.repository }}/branches"
+          set -euo pipefail
+          if ! printf '%s' "${BRANCH}" | grep -Eq '^[A-Za-z0-9._/-]+$'; then
+            echo "::error::unsafe branch name; refusing to proceed"; exit 1
+          fi
+          API="${API_BASE}/api/v1/repos/${REPO}/branches"
           # URL-encode the branch name's slashes (no PHP dependency on the runner)
           ENCODED=$(printf '%s' "${BRANCH}" | sed 's|/|%2F|g')
 
           STATUS=$(curl -sf -o /dev/null -w "%{http_code}" -X DELETE \
-            -H "Authorization: token ${{ secrets.MOKOGIT_TOKEN }}" \
+            -H "Authorization: token ${MOKOGIT_TOKEN}" \
             "${API}/${ENCODED}" 2>/dev/null || true)
 
           if [ "$STATUS" = "204" ]; then

.mokogit/workflows/issue-branch.yml

@@ -27,14 +27,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Create branch and comment
+        # SECURITY: never interpolate github.event.* into a run: script — the
+        # Actions engine splices the raw value into the shell source (command
+        # injection via a crafted issue title). Pass everything through env so
+        # the values arrive as ordinary shell variables that are not re-parsed.
+        env:
+          MOKOGIT_TOKEN: ${{ secrets.MOKOGIT_TOKEN }}
+          REPO: ${{ github.repository }}
+          ISSUE_NUM: ${{ github.event.issue.number }}
+          ISSUE_TITLE: ${{ github.event.issue.title }}
         run: |
-          TOKEN="${{ secrets.MOKOGIT_TOKEN }}"
-          API="${MOKOGIT_URL}/api/v1/repos/${{ github.repository }}"
-          ISSUE_NUM="${{ github.event.issue.number }}"
-          ISSUE_TITLE="${{ github.event.issue.title }}"
+          TOKEN="${MOKOGIT_TOKEN}"
+          API="${MOKOGIT_URL}/api/v1/repos/${REPO}"
 
-          # Build slug from title: lowercase, replace non-alnum with dash, trim
-          SLUG=$(echo "${ISSUE_TITLE}" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | sed 's/^-//;s/-$//' | cut -c1-40)
+          # Build slug from title: lowercase, replace non-alnum with dash, trim.
+          # printf (not echo) so a title beginning with "-" is not read as flags.
+          SLUG=$(printf '%s' "${ISSUE_TITLE}" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | sed 's/^-//;s/-$//' | cut -c1-40)
           BRANCH="feature/${ISSUE_NUM}-${SLUG}"
 
           # Check dev branch exists
@@ -58,7 +66,7 @@ jobs:
             echo "Created branch: ${BRANCH}"
 
             # Comment on issue with branch link
-            REPO_URL="${MOKOGIT_URL}/${{ github.repository }}"
+            REPO_URL="${MOKOGIT_URL}/${REPO}"
             BODY="Branch created: [\`${BRANCH}\`](${REPO_URL}/src/branch/${BRANCH})\n\n\`\`\`bash\ngit fetch origin\ngit checkout ${BRANCH}\n\`\`\`"
 
             curl -sf -X POST \