diff --git a/.github/actions/check-skip-merge-queue/action.yml b/.github/actions/check-skip-merge-queue/action.yml
new file mode 100644
index 000000000..7b505b50e
--- /dev/null
+++ b/.github/actions/check-skip-merge-queue/action.yml
@@ -0,0 +1,119 @@
+name: Check skip merge queue
+description: >-
+  Report whether the pull request in a merge group is first in the queue and
+  already up to date with the base branch, in which case the checks about to run
+  would test a commit nothing has changed under.
+
+  Only the report is produced here. Nothing can make the merge queue skip an
+  entry from inside a workflow, so callers gate their own jobs on the output.
+
+# Ported from MetaMask/github-tools/.github/actions/check-skip-merge-queue,
+# which calls actions/github-script by mutable tag. See the note in
+# ../checkout-and-setup/action.yml for why that cannot be pinned from outside.
+
+inputs:
+  head-ref:
+    description: The merge group's head ref, which carries the pull request number.
+    required: true
+    default: ${{ github.event.merge_group.head_ref }}
+  base-ref:
+    description: The branch the pull request is merging into.
+    required: true
+    default: main
+  github-token:
+    description: The token used to read the pull request and compare branches.
+    required: true
+    default: ${{ github.token }}
+
+outputs:
+  up-to-date:
+    description: >-
+      Whether the pull request is first in the queue and up to date with the
+      base branch. `false` whenever that cannot be established, so a failure
+      here costs a redundant run rather than an untested merge.
+    value: ${{ steps.up-to-date.outputs.up-to-date || 'false' }}
+
+runs:
+  using: composite
+  steps:
+    # `continue-on-error` on both steps: this is an optimization, and the safe
+    # answer is always available. A throw here leaves `up-to-date` empty, which
+    # the output above reads as `false`.
+    - name: Find the pull request behind the merge group
+      continue-on-error: true
+      id: pr-details
+      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+      env:
+        HEAD_REF: ${{ inputs.head-ref }}
+      with:
+        github-token: ${{ inputs.github-token }}
+        script: |
+          const { HEAD_REF } = process.env;
+          const match = HEAD_REF.match(/\/pr-([0-9]+)-/u);
+          if (!match) {
+            return core.setFailed(`Could not extract pull request number from head ref: "${HEAD_REF}".`);
+          }
+
+          const number = parseInt(match[1], 10);
+          const result = await github.graphql(`
+            query($owner: String!, $name: String!, $number: Int!) {
+              repository(owner: $owner, name: $name) {
+                pullRequest(number: $number) {
+                  headRefName
+                  mergeQueueEntry { position }
+                }
+              }
+            }
+          `, {
+            owner: context.repo.owner,
+            name: context.repo.repo,
+            number,
+          });
+
+          if (!result.repository.pullRequest) {
+            return core.setFailed(`Pull request #${number} not found in repository "${context.repo.owner}/${context.repo.repo}".`);
+          }
+
+          const position = result.repository.pullRequest.mergeQueueEntry?.position;
+          if (!position) {
+            return core.setFailed(`Pull request #${number} is not in the merge queue.`);
+          }
+
+          core.setOutput('pr-number', number);
+          core.setOutput('pr-branch', result.repository.pullRequest.headRefName);
+          core.setOutput('merge-queue-position', position);
+
+    - name: Check whether it is up to date with the base branch
+      continue-on-error: true
+      id: up-to-date
+      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+      env:
+        BASE_REF: ${{ inputs.base-ref }}
+        PR_BRANCH: ${{ steps.pr-details.outputs.pr-branch }}
+        MERGE_QUEUE_POSITION: ${{ steps.pr-details.outputs.merge-queue-position }}
+      with:
+        github-token: ${{ inputs.github-token }}
+        script: |
+          const { BASE_REF, PR_BRANCH, MERGE_QUEUE_POSITION } = process.env;
+
+          // Only the first entry can be up to date with the base branch by
+          // definition; anything behind it is waiting on merges above it.
+          if (parseInt(MERGE_QUEUE_POSITION, 10) !== 1) {
+            core.info(`Pull request is not first in the merge queue (position: ${MERGE_QUEUE_POSITION}).`);
+            core.setOutput('up-to-date', 'false');
+            return;
+          }
+
+          const comparison = await github.rest.repos.compareCommitsWithBasehead({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            basehead: `${BASE_REF}...${PR_BRANCH}`,
+          });
+
+          if (comparison.data.status === 'identical' || comparison.data.status === 'ahead') {
+            core.info(`Pull request branch "${PR_BRANCH}" is up-to-date with base branch "${BASE_REF}".`);
+            core.setOutput('up-to-date', 'true');
+          } else {
+            core.info(`Pull request branch "${PR_BRANCH}" is not up-to-date with base branch "${BASE_REF}".`);
+            core.setOutput('up-to-date', 'false');
+          }
diff --git a/.github/actions/setup-environment/action.yml b/.github/actions/setup-environment/action.yml
new file mode 100644
index 000000000..9fe1d67d5
--- /dev/null
+++ b/.github/actions/setup-environment/action.yml
@@ -0,0 +1,65 @@
+name: Set up environment
+description: Set up Node.js and Yarn and install dependencies, in a repository already checked out.
+
+# Replaces the setup half of MetaMask/action-checkout-and-setup. That action is
+# pinned by SHA where we call it, but calls actions/checkout, actions/setup-node
+# and actions/cache by mutable tag internally, which this organization refuses --
+# rightly, since a pin one layer deep is no pin at all. Keeping the steps here is
+# the only way to pin the whole chain, and the chain is short.
+#
+# Checkout is not part of this action and cannot be: `uses: ./...` resolves
+# against the workspace, so the repository has to be on disk before the runner
+# can find this file. Callers check out first, with their own pinned step.
+#
+# Deliberately narrower than the action it replaces: no node_modules cache and
+# no lookup-only fast path, only Yarn's download cache. Those are worth real
+# minutes on a monorepo this size, but they turn on a cache key that has to
+# account for the native rebuilds `postinstall` runs, and getting that subtly
+# wrong yields a job that passes against stale binaries. `yarn install` runs
+# every time here, so what is on disk always matches the lockfile.
+
+inputs:
+  node-version:
+    description: The Node.js version to use. Defaults to the one in `.nvmrc`.
+    required: false
+    default: ''
+  cache:
+    description: >-
+      Whether to restore and save Yarn's download cache. Pass `false` from jobs
+      holding publish credentials, where a poisoned entry buys an attacker more
+      than the cache saves us.
+    required: false
+    default: 'true'
+
+runs:
+  using: composite
+  steps:
+    - name: Set up Node.js
+      uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+      with:
+        node-version: ${{ inputs.node-version }}
+        node-version-file: ${{ inputs.node-version == '' && '.nvmrc' || '' }}
+
+    - name: Enable Corepack
+      shell: bash
+      run: corepack enable
+
+    # `enableGlobalCache: false` puts Yarn's downloads in `.yarn/cache`, which is
+    # gitignored, so without this every job refetches the whole dependency tree.
+    # Restoring a partial cache is still worth it, hence `restore-keys`: a
+    # lockfile change invalidates the key but leaves most entries reusable.
+    - name: Restore Yarn's download cache
+      if: inputs.cache == 'true'
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+      with:
+        path: .yarn/cache
+        key: yarn-${{ runner.os }}-${{ inputs.node-version }}-${{ hashFiles('yarn.lock') }}
+        restore-keys: |
+          yarn-${{ runner.os }}-${{ inputs.node-version }}-
+          yarn-${{ runner.os }}-
+
+    # The LavaMoat plugin in `.yarnrc.yml` runs the scripts `lavamoat.allowScripts`
+    # permits, so there is no separate `yarn allow-scripts` step to run.
+    - name: Install dependencies
+      shell: bash
+      run: yarn install --immutable
diff --git a/.github/workflows/changelog-check.yml b/.github/workflows/changelog-check.yml
index 930dd3b60..88cc67c4c 100644
--- a/.github/workflows/changelog-check.yml
+++ b/.github/workflows/changelog-check.yml
@@ -8,12 +8,58 @@ jobs:
   check-changelog:
     name: Check changelog
     runs-on: ubuntu-latest
+    # `no-changelog` is the escape hatch for a pull request that genuinely
+    # changes no published behaviour.
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'no-changelog') }}
     steps:
-      - name: Check changelog
-        uses: MetaMask/github-tools/.github/actions/check-changelog@d0f155aad5d7b5403d29a094c2f752238bf43237 # v1.18.2
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
-          base-branch: ${{ github.event.pull_request.base.ref }}
-          head-ref: ${{ github.head_ref }}
-          labels: ${{ toJSON(github.event.pull_request.labels) }}
-          pr-number: ${{ github.event.pull_request.number }}
-          repo: ${{ github.repository }}
+          # The whole comparison is against the merge base, so the history back
+          # to it has to be here.
+          fetch-depth: 0
+
+      - name: Require a changelog entry for every package this changes
+        shell: bash
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          set -euo pipefail
+
+          # Against the merge base rather than the base tip, so that commits
+          # landing on the base branch after this pull request opened are not
+          # read as its own changes.
+          merge_base="$(git merge-base "$BASE_SHA" "$HEAD_SHA")"
+          changed="$(git diff --name-only "$merge_base" "$HEAD_SHA")"
+
+          missing=()
+          for package_dir in packages/*/; do
+            package="${package_dir%/}"
+            changelog="${package}/CHANGELOG.md"
+
+            # A package with no changelog is private and releases nothing, so
+            # there is no entry for it to be missing. This is the same set
+            # `yarn changelog:validate` covers, which runs `--no-private`.
+            [[ -f "$changelog" ]] || continue
+
+            # Changes to the changelog itself do not oblige a changelog entry.
+            if ! grep -qE "^${package}/" <<< "$changed" \
+               || [[ "$(grep -E "^${package}/" <<< "$changed")" == "$changelog" ]]; then
+              continue
+            fi
+
+            grep -qxF "$changelog" <<< "$changed" || missing+=("$package")
+          done
+
+          if [[ ${#missing[@]} -gt 0 ]]; then
+            echo "::error::These packages changed without a changelog entry:"
+            printf '  %s\n' "${missing[@]}"
+            echo
+            echo "Add an entry under '## [Unreleased]' in each package's CHANGELOG.md,"
+            echo "or apply the 'no-changelog' label if this genuinely changes no"
+            echo "published behaviour."
+            exit 1
+          fi
+
+          echo "Every changed package has a changelog entry."
diff --git a/.github/workflows/lint-build-test.yml b/.github/workflows/lint-build-test.yml
index 4d2a83f93..a75af652a 100644
--- a/.github/workflows/lint-build-test.yml
+++ b/.github/workflows/lint-build-test.yml
@@ -11,11 +11,11 @@ jobs:
       matrix:
         node-version: [22.x, 24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          cache-node-modules: true
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
 
   lint:
@@ -26,10 +26,11 @@ jobs:
       matrix:
         node-version: [24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - run: yarn lint
       - name: Require clean working directory
@@ -48,10 +49,11 @@ jobs:
       matrix:
         node-version: [24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - run: yarn changelog:validate
       - name: Require clean working directory
@@ -70,10 +72,11 @@ jobs:
       matrix:
         node-version: [24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - run: yarn build
       - name: Require clean working directory
@@ -92,10 +95,11 @@ jobs:
       matrix:
         node-version: [22.x, 24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - uses: ./.github/actions/playwright-install
       - run: yarn build
@@ -123,10 +127,11 @@ jobs:
       matrix:
         node-version: [22.x, 24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - run: yarn build
       - run: yarn test:integration
@@ -165,10 +170,11 @@ jobs:
           - package: '@ocap/evm-wallet-experiment'
             directory: evm-wallet-experiment
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - uses: ./.github/actions/playwright-install
       - run: VITE_DB_FOLDER=e2e yarn build
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6d311621f..6ae0250ee 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Check pull request merge queue status
         id: check-skip-merge-queue
         if: github.event_name == 'merge_group'
-        uses: MetaMask/github-tools/.github/actions/check-skip-merge-queue@d0f155aad5d7b5403d29a094c2f752238bf43237 # v1.18.2
+        uses: ./.github/actions/check-skip-merge-queue
 
   detect-changes:
     name: Detect changes
@@ -149,10 +149,11 @@ jobs:
       matrix:
         node-version: [24.x]
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: false
           node-version: ${{ matrix.node-version }}
       - run: yarn lint
       - name: Require clean working directory
diff --git a/.github/workflows/publish-release.yml b/.github/workflows/publish-release.yml
index 44ec99da2..55635ae12 100644
--- a/.github/workflows/publish-release.yml
+++ b/.github/workflows/publish-release.yml
@@ -12,10 +12,12 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
         with:
-          is-high-risk-environment: true
+          cache: false
       - uses: MetaMask/action-publish-release@f01f1be110d60fb07d86c880ce3d6bdb353524d3 # v3.3.1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -40,11 +42,14 @@ jobs:
     runs-on: ubuntu-latest
     needs: publish-release
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
-          is-high-risk-environment: true
           ref: ${{ github.sha }}
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
+        with:
+          cache: false
       - name: Restore build artifacts
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
@@ -63,11 +68,14 @@ jobs:
     runs-on: ubuntu-latest
     needs: publish-npm-dry-run
     steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@0543b5929698c71e3ccc6ed24eac87825669b5de # v3.5.0
+      - name: Check out the repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
-          is-high-risk-environment: true
           ref: ${{ github.sha }}
+      - name: Set up environment
+        uses: ./.github/actions/setup-environment
+        with:
+          cache: false
       - name: Restore build artifacts
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with: