diff --git a/.github/workflows/bootstrap-fog-version-check-stub-sweep.yml b/.github/workflows/bootstrap-fog-version-check-stub-sweep.yml
new file mode 100644
index 0000000..f40df20
--- /dev/null
+++ b/.github/workflows/bootstrap-fog-version-check-stub-sweep.yml
@@ -0,0 +1,66 @@
+name: Sweep for branches missing the FOG version check stub
+
+# Runs daily. Lists fogproject branches, filters to the ones
+# check-fog-version.yml watches (working-1.6/dev-branch/rc-*/feature-*,
+# `stable` excluded), and hands off any that are missing the stub to
+# bootstrap-fog-version-check-stub.yml.
+#
+# This exists instead of a create-triggered stub in fogproject because
+# GitHub only resolves a `create`-event workflow from the repo's default
+# branch, which for fogproject is `stable` - and this project's automation
+# is kept off of `stable` entirely. A daily delay before a brand-new branch
+# starts being watched is an acceptable trade for that: it only delays when
+# watching starts, it doesn't cause a missed version fix on a branch
+# already being watched.
+
+on:
+  schedule:
+    - cron: "30 4 * * *"
+  workflow_dispatch: {}
+
+jobs:
+  discover:
+    runs-on: ubuntu-24.04
+    outputs:
+      branches: ${{ steps.discover.outputs.branches }}
+    steps:
+      - uses: actions/create-github-app-token@v3
+        id: app-token
+        with:
+          client-id: ${{ vars.FOG_WORKFLOWS_APPID }}
+          private-key: ${{ secrets.FOG_WORKFLOWS_PRIVATE_KEY }}
+          owner: FOGProject
+          repositories: "fogproject"
+
+      - name: Find watched branches missing the stub
+        id: discover
+        env:
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
+        run: |
+          set -e
+          all_branches=$(gh api repos/FOGProject/fogproject/branches --paginate --jq '.[].name')
+
+          missing=()
+          for b in $all_branches; do
+            case "$b" in
+                working-1.6|dev-branch|rc-*|feature-*) ;;
+                *) continue ;;
+            esac
+            if ! gh api "repos/FOGProject/fogproject/contents/.github/workflows/check-fog-version.yml?ref=$b" >/dev/null 2>&1; then
+              missing+=("$b")
+            fi
+          done
+
+          json=$(printf '%s\n' "${missing[@]:-}" | jq -R . | jq -sc 'map(select(length > 0))')
+          echo "branches=$json" >> "$GITHUB_OUTPUT"
+          echo "Missing the stub on: $json"
+
+  bootstrap:
+    needs: discover
+    if: needs.discover.outputs.branches != '[]'
+    strategy:
+      matrix:
+        branch: ${{ fromJson(needs.discover.outputs.branches) }}
+    uses: ./.github/workflows/bootstrap-fog-version-check-stub.yml
+    with:
+      branch: ${{ matrix.branch }}
diff --git a/.github/workflows/bootstrap-fog-version-check-stub.yml b/.github/workflows/bootstrap-fog-version-check-stub.yml
new file mode 100644
index 0000000..4109991
--- /dev/null
+++ b/.github/workflows/bootstrap-fog-version-check-stub.yml
@@ -0,0 +1,89 @@
+name: Bootstrap FOG version check stub
+
+# Single-branch worker, called by bootstrap-fog-version-check-stub-sweep.yml
+# for each fogproject branch missing the stub (also runnable by hand via
+# workflow_dispatch against one branch).
+#
+# check-fog-version.yml's push trigger only fires on a branch that already
+# has a copy of that stub file committed to it. New feature-*/rc-* branches
+# cut from dev-branch inherit it for free once dev-branch has it, but a
+# branch created from anywhere else (or before dev-branch had it) would
+# silently never be watched. This copies the canonical stub - whatever is
+# currently committed on dev-branch - onto the given branch directly, if it
+# matches the watched patterns and doesn't already have it.
+#
+# Never touches `stable` (excluded from the watched patterns, same as
+# check-fog-version.yml itself) or any branch outside those patterns.
+# Deliberately not triggered by anything in fogproject itself (unlike
+# check-fog-version.yml's push stub) - GitHub only resolves a `create`-event
+# workflow from fogproject's default branch, which is `stable`, and this
+# repo's automation is kept off of `stable` entirely. The sweep workflow
+# polls instead.
+
+on:
+  workflow_call:
+    inputs:
+      branch:
+        required: true
+        type: string
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "fogproject branch to bootstrap the stub onto"
+        required: true
+        type: string
+
+jobs:
+  bootstrap-stub:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check branch matches watched patterns
+        id: match
+        env:
+          BRANCH: ${{ inputs.branch }}
+        run: |
+          matches=false
+          case "$BRANCH" in
+              working-1.6|dev-branch|rc-*|feature-*) matches=true ;;
+          esac
+          echo "matches=$matches" >> "$GITHUB_OUTPUT"
+
+      - uses: actions/create-github-app-token@v3
+        if: steps.match.outputs.matches == 'true'
+        id: app-token
+        with:
+          client-id: ${{ vars.FOG_WORKFLOWS_APPID }}
+          private-key: ${{ secrets.FOG_WORKFLOWS_PRIVATE_KEY }}
+          owner: FOGProject
+          repositories: "fogproject"
+
+      - uses: actions/checkout@v7
+        if: steps.match.outputs.matches == 'true'
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+          repository: FOGProject/fogproject
+          ref: ${{ inputs.branch }}
+
+      - name: Copy the stub from dev-branch if this branch doesn't have it yet
+        if: steps.match.outputs.matches == 'true'
+        env:
+          BRANCH: ${{ inputs.branch }}
+          BOT_SLUG: ${{ steps.app-token.outputs.app-slug }}
+        run: |
+          set -e
+          stub_path=".github/workflows/check-fog-version.yml"
+
+          if [ -f "$stub_path" ]; then
+            echo "Stub already present on $BRANCH - nothing to do."
+            exit 0
+          fi
+
+          git fetch --depth 1 origin dev-branch
+          mkdir -p "$(dirname "$stub_path")"
+          git show origin/dev-branch:"$stub_path" > "$stub_path"
+
+          git config user.name "${BOT_SLUG}[bot]"
+          git config user.email "${BOT_SLUG}[bot]@users.noreply.github.com"
+          git add "$stub_path"
+          git commit -m "ci: bootstrap check-fog-version stub on ${BRANCH}"
+          git push origin "HEAD:${BRANCH}"
diff --git a/.github/workflows/check-fog-version-sweep.yml b/.github/workflows/check-fog-version-sweep.yml
new file mode 100644
index 0000000..a9e6ed9
--- /dev/null
+++ b/.github/workflows/check-fog-version-sweep.yml
@@ -0,0 +1,61 @@
+name: Sweep FOG version check across all watched branches
+
+# Failsafe catch-all, running daily in addition to the push-triggered stub in
+# fogproject. The push trigger should catch essentially everything, but this
+# covers anything it misses - a missed webhook delivery, an Actions outage
+# during the original push, a branch whose stub hadn't been bootstrapped yet
+# at push time, etc.
+#
+# Lists fogproject branches, filters to the ones check-fog-version.yml
+# watches (working-1.6/dev-branch/rc-*/feature-*, `stable` excluded - owned
+# by stable-releases.yml's release flow), and runs the real check-and-fix
+# workflow against every one of them, whether or not the push stub is even
+# present there yet.
+
+on:
+  schedule:
+    - cron: "45 4 * * *"
+  workflow_dispatch: {}
+
+jobs:
+  discover:
+    runs-on: ubuntu-24.04
+    outputs:
+      branches: ${{ steps.discover.outputs.branches }}
+    steps:
+      - uses: actions/create-github-app-token@v3
+        id: app-token
+        with:
+          client-id: ${{ vars.FOG_WORKFLOWS_APPID }}
+          private-key: ${{ secrets.FOG_WORKFLOWS_PRIVATE_KEY }}
+          owner: FOGProject
+          repositories: "fogproject"
+
+      - name: List watched branches
+        id: discover
+        env:
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}
+        run: |
+          set -e
+          all_branches=$(gh api repos/FOGProject/fogproject/branches --paginate --jq '.[].name')
+
+          watched=()
+          for b in $all_branches; do
+            case "$b" in
+                working-1.6|dev-branch|rc-*|feature-*) watched+=("$b") ;;
+            esac
+          done
+
+          json=$(printf '%s\n' "${watched[@]:-}" | jq -R . | jq -sc 'map(select(length > 0))')
+          echo "branches=$json" >> "$GITHUB_OUTPUT"
+          echo "Watched branches: $json"
+
+  check-version:
+    needs: discover
+    if: needs.discover.outputs.branches != '[]'
+    strategy:
+      matrix:
+        branch: ${{ fromJson(needs.discover.outputs.branches) }}
+    uses: ./.github/workflows/check-fog-version.yml
+    with:
+      branch: ${{ matrix.branch }}
diff --git a/.github/workflows/check-fog-version.yml b/.github/workflows/check-fog-version.yml
new file mode 100644
index 0000000..483c156
--- /dev/null
+++ b/.github/workflows/check-fog-version.yml
@@ -0,0 +1,132 @@
+name: Check FOG version
+
+# Reusable workflow backing:
+#  - the push-triggered stub in FOGProject/fogproject's
+#    .github/workflows/check-fog-version.yml (instant, per-branch), and
+#  - check-fog-version-sweep.yml in this repo (daily, all watched branches -
+#    a failsafe catch-all for anything the push trigger misses, e.g. a
+#    missed webhook delivery or an Actions outage during the original push).
+# Also directly workflow_dispatch-able against a single branch by hand.
+# See fog-docs' Development section for the full picture of why this is
+# split across two repos.
+#
+# Recomputes FOG_VERSION/FOG_CHANNEL using the same formula as fogproject's
+# .githooks/pre-commit. That hook is client-side and never runs on a PR merged
+# via GitHub's web UI, so this independently recomputes what the version
+# should be and, if it disagrees with what's actually committed, pushes the
+# fix directly to the branch that drifted - no fix branch, no PR, since this
+# is a mechanical correction of the same kind the hook already makes locally.
+#
+# Never invoked for `stable` - that branch's version is owned entirely by
+# stable-releases.yml's release flow.
+
+on:
+  workflow_call:
+    inputs:
+      branch:
+        required: true
+        type: string
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "fogproject branch to check"
+        required: true
+        type: string
+
+jobs:
+  check-version:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/create-github-app-token@v3
+        id: app-token
+        with:
+          client-id: ${{ vars.FOG_WORKFLOWS_APPID }}
+          private-key: ${{ secrets.FOG_WORKFLOWS_PRIVATE_KEY }}
+          owner: FOGProject
+          repositories: "fogproject"
+
+      - uses: actions/checkout@v7
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+          repository: FOGProject/fogproject
+          ref: ${{ inputs.branch }}
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Fetch master (needed by the version formula)
+        run: git fetch origin master:master
+
+      - name: Compute expected FOG_VERSION / FOG_CHANNEL
+        env:
+          GITBRANCH: ${{ inputs.branch }}
+        run: |
+          set -e
+          system_file="packages/web/lib/fog/system.class.php"
+
+          gitcom=$(git rev-list --tags --no-walk --max-count=1)
+          gitcount=$(git rev-list master..HEAD --count)
+
+          branchon=$(echo "$GITBRANCH" | awk -F'-' '{print $1}')
+          branchend=$(echo "$GITBRANCH" | awk -F'-' '{print $2}')
+
+          current_version=$(grep "define('FOG_VERSION'" "$system_file" | sed "s/.*FOG_VERSION', '\([^']*\)');/\1/")
+          current_channel=$(grep "define('FOG_CHANNEL'" "$system_file" | sed "s/.*FOG_CHANNEL', '\([^']*\)');/\1/")
+
+          verbegin=""
+          channel="$current_channel"
+          trunkversion="$current_version"
+
+          case "$branchon" in
+              dev)
+                  tagversion=$(git describe --tags "$gitcom")
+                  baseversion=${tagversion%.*}
+                  trunkversion="${baseversion}.${gitcount}"
+                  channel="Patches"
+                  ;;
+              working)
+                  verbegin="${branchend}.0-beta"
+                  trunkversion="${verbegin}.${gitcount}"
+                  channel="Beta"
+                  ;;
+              rc)
+                  channel="Release Candidate"
+                  version_prefix="${branchend}.0-RC"
+                  n=$(printf '%s\n' "$current_version" | sed -n "s/^${version_prefix}-\([0-9][0-9]*\)\$/\1/p")
+                  if [ -n "$n" ]; then
+                      trunkversion="${version_prefix}-$((n + 1))"
+                  else
+                      trunkversion="${version_prefix}-1"
+                  fi
+                  ;;
+              feature)
+                  verbegin="${branchend}.0-feature"
+                  trunkversion="${verbegin}.${gitcount}"
+                  channel="Feature"
+                  ;;
+          esac
+
+          sed -i "s/define('FOG_VERSION',.*);/define('FOG_VERSION', '$trunkversion');/g" "$system_file"
+          sed -i "s/define('FOG_CHANNEL',.*);/define('FOG_CHANNEL', '$channel');/g" "$system_file"
+
+      - name: Commit and push if the committed version is stale
+        env:
+          GITBRANCH: ${{ inputs.branch }}
+          BOT_SLUG: ${{ steps.app-token.outputs.app-slug }}
+        run: |
+          set -e
+          system_file="packages/web/lib/fog/system.class.php"
+
+          if git diff --quiet -- "$system_file"; then
+            echo "Version already correct on $GITBRANCH - nothing to do."
+            exit 0
+          fi
+
+          echo "Version drift detected on $GITBRANCH:"
+          git diff -- "$system_file"
+
+          git config user.name "${BOT_SLUG}[bot]"
+          git config user.email "${BOT_SLUG}[bot]@users.noreply.github.com"
+
+          git add "$system_file"
+          git commit -m "chore: fix stale FOG_VERSION/FOG_CHANNEL on ${GITBRANCH}"
+          git push origin "HEAD:${GITBRANCH}"