diff --git a/.github/workflows/build-pprd.yml b/.github/workflows/build-pprd.yml
index 2612c86c..6cf9834e 100644
--- a/.github/workflows/build-pprd.yml
+++ b/.github/workflows/build-pprd.yml
@@ -6,7 +6,6 @@ on:
       - pprd
       - epic/v3
       - any/branch-you-want
-      - fix/docs_dir-not-set
 
 jobs:
   docker:
diff --git a/.github/workflows/build-preview.yml b/.github/workflows/build-preview.yml
deleted file mode 100644
index ee139b8f..00000000
--- a/.github/workflows/build-preview.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-name: ❌ DS User Guide Previews
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - '*'
-
-jobs:
-  docker:
-    runs-on: ubuntu-latest
-    steps:
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-      -
-        name: Login to DockerHub
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      -
-        name: Build and push
-        uses: docker/build-push-action@v2
-        with:
-          push: true
-          tags: designsafeci/ds-use-case-template:latest
-      -
-        name: Post build status in slack
-        id: slack
-        uses: slackapi/slack-github-action@v1.18.0
-        with:
-          # This data can be any valid JSON from a previous step in the GitHub Action
-          payload: |
-            {
-              "build_status": "${{ job.status }}"
-            }
-        env:
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
diff --git a/.github/workflows/requirements-validate.yml b/.github/workflows/requirements-validate.yml
new file mode 100644
index 00000000..de140da0
--- /dev/null
+++ b/.github/workflows/requirements-validate.yml
@@ -0,0 +1,41 @@
+# Humans should not manage requirements.txt (bots do)
+name: Validate requirements.txt not changed by human
+
+on:
+  pull_request:
+    paths: ['requirements.txt']
+    types: [opened, synchronize, reopened]
+
+jobs:
+  reject-requirements-drift:
+    runs-on: ubuntu-latest
+
+    # Skip if the last commit was from the bot (prevent unnecessary check)
+    if: github.event.head_commit.author.name != 'github-actions[bot]'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # full history
+
+      - name: Check if requirements.txt was modified unexpectedly
+        run: |
+          # For PRs, check against base branch
+          # For pushes, check last commit
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            BASE_REF="${{ github.event.pull_request.base.sha }}"
+            COMPARE_RANGE="$BASE_REF...HEAD"
+          else
+            COMPARE_RANGE="HEAD~1..HEAD"
+          fi
+
+          # If requirements.txt modified in that range
+          if git diff --name-only $COMPARE_RANGE | grep -q "^requirements.txt$"; then
+            echo "::error::You may NOT edit 'requirements.txt'"
+            echo "::warning::Undo your changes to requirements.txt, so robot can maintain it."
+            echo "::notice::To pin dependencies, use 'poetry add <package-name>'."
+            exit 1
+          fi
+
+          echo "'requirements.txt' unchanged (or only changed by bot)"
diff --git a/.github/workflows/requirments-sync.yml b/.github/workflows/requirments-sync.yml
new file mode 100644
index 00000000..2c38f60f
--- /dev/null
+++ b/.github/workflows/requirments-sync.yml
@@ -0,0 +1,85 @@
+# Netlify requires requirements.txt (humans do not)
+name: Sync requirements.txt with pyproject.toml
+
+on:
+  pull_request:
+    paths: ['pyproject.toml']
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: write
+
+jobs:
+  detect-requirements-delta:
+    runs-on: ubuntu-latest
+    outputs:
+      has_change: ${{ steps.detect.outputs.has_change }}
+
+    # Skip if the last commit was from the bot (prevent infinite loops)
+    if: github.event.head_commit.author.name != 'github-actions[bot]'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref || github.ref_name }}
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: 'pyproject.toml'
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Detect whether requirements.txt has change
+        id: detect
+        run: |
+          output=$(make requirements.txt 2>&1)
+          echo "$output"
+
+          # Check whether Make output suggests file is up to date
+          if echo "$output" | grep -qi "up to date\|up-to-date\|already up to date"; then
+            echo "has_change=false" >> $GITHUB_OUTPUT
+            echo "::notice::requirements.txt seems up to date"
+          else
+            echo "has_change=true" >> $GITHUB_OUTPUT
+          fi
+
+  commit-requirements-delta:
+    runs-on: ubuntu-latest
+    needs: detect-requirements-delta
+    if: needs.detect-requirements-delta.outputs.has_change == 'true'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref || github.ref_name }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: 'pyproject.toml'
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Generate requirements.txt
+        run: make requirements.txt
+
+      - name: Configure Git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+      - name: Commit requirements.txt if changed
+        run: |
+          git add -f requirements.txt
+          if git diff --staged --quiet; then
+            echo "No changes to requirements.txt"
+          else
+            git commit -m "chore: auto-update requirements.txt [bot]"
+            git push
+          fi
diff --git a/Makefile b/Makefile
index a4ca235d..b4707b08 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,13 @@
 # WARNING: Using `docker-compose` is deprecated
 DOCKER_COMPOSE_CMD := $(shell if command -v docker-compose > /dev/null; then echo "docker-compose"; else echo "docker compose"; fi)
 
+
+requirements.txt: poetry.lock
+	pip install --user poetry-plugin-export \
+	&& poetry export -f requirements.txt --output requirements.txt \
+	&& pip uninstall --yes poetry-plugin-export
+
+
 .PHONY: build
 build:
 	$(DOCKER_COMPOSE_CMD) -f ./docker-compose.yml build
diff --git a/TESTING.md b/TESTING.md
index c1b39cd0..5a5ab2d4 100644
--- a/TESTING.md
+++ b/TESTING.md
@@ -1,24 +1,31 @@
 # How to Test
 
-## Local Server
+- [On Free Machine](#on-free-machine)
+- [On Your Machine](#on-your-machine)
+- [On Our Machine](#on-our-machine)
 
-> [!WARNING]
-> Testing is manual and requires using a command prompt.
+## On Free Machine
+
+> [!TIP]
+> Create a pull request; automatically get a remote preview server.
 
-You can [test with **PIP** or **Poetry** or **Docker** or **Make**](https://tacc.github.io/mkdocs-tacc/test/#test-locally) as a client.
+## On Your Machine
 
-## Remote Server
+> [!NOTE]
+> Run a server manually or programatically on your machine.
 
-> [!WARNING]
-> Your test may be overridden by others working on the same test server.
+You can [test with **PIP** or **Poetry** or **Docker** or **Make**](https://tacc.github.io/mkdocs-tacc/test/#test-locally).
 
-Deploy to our test server:
+## On Our Machine
+
+> [!WARNING]
+> Only authorized contributors may deploy to our test server.
 
 0. Have a branch with changes ready to deploy.
-1. On your branch, edit the [pre-prod workflow config](./.github/workflows/build-pprd.yml) `branches:` list.
+1. On your branch, edit the [pre-prod workflow config](./.github/workflows/build-pprd.yml) `branches:` list to include your branch.
 2. Commit the change to trigger the workflow.
 3. Wait for [GitHub action](https://github.com/DesignSafe-CI/ds-user-guide/actions) to complete.
 4. Load https://pprd.designsafe-ci.org/user-guide/.
 
-> [!TIP]
-> In the future, we will offer a dedicated test server. Task is pending [issue #61](https://github.com/DesignSafe-CI/DS-User-Guide/issues/61).
+> [!CAUTION]
+> Others can override your test by deploying to this server.