Implement P05 checked services and safe selected delivery recovery

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a092fe-13b1-7f12-ac74-7d258af4d79c

.forgejo/workflows/acceptance.yaml

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+name: Transactional mail acceptance
+on:
+  push:
+    branches: [main]
+    paths: ["src/**", "tests/**", "pyproject.toml", ".forgejo/workflows/acceptance.yaml"]
+  workflow_dispatch:
+jobs:
+  mail:
+    runs-on: ubuntu-latest
+    container:
+      image: python:3.12-slim@sha256:d764629ce0ddd8c71fd371e9901efb324a95789d2315a47db7e4d27e78f1b0e9
+    steps:
+      - name: Test exact source commit
+        run: |
+          set -eu
+          mkdir source
+          python -c 'import os, urllib.request; urllib.request.urlretrieve("https://forgejo.coulomb.social/" + os.environ["GITHUB_REPOSITORY"] + "/archive/" + os.environ["GITHUB_SHA"] + ".tar.gz", "source.tar.gz")'
+          tar xzf source.tar.gz -C source --strip-components=1
+          cd source
+          pip install . pytest
+          PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=src python -m pytest -p no:cacheprovider -q

.forgejo/workflows/image.yaml

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+name: Build and Publish Container Image
+
+# Modelled on tenant-engine/.forgejo/workflows/image.yaml. Images are built
+# by CI from a tarball of the pushed commit, never from a workstation tree.
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - ".forgejo/workflows/image.yaml"
+      - "Containerfile"
+      - "src/**"
+      - "pyproject.toml"
+      - "README.md"
+      - "LICENSE"
+  workflow_dispatch:
+
+env:
+  REGISTRY: forgejo.coulomb.social
+  IMAGE_NAME: coulomb/email-connect
+  DOCKER_HOST: tcp://127.0.0.1:2375
+
+jobs:
+  build-and-push:
+    runs-on: container-build
+    steps:
+      - name: Build and push image
+        env:
+          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+        run: |
+          set -eu
+          REF="${GITHUB_SHA:-main}"
+          SHORT="${REF:0:7}"
+          mkdir -p buildctx "${HOME}/bin"
+          wget -qO /tmp/repo.tar.gz \
+            "https://forgejo.coulomb.social/${GITHUB_REPOSITORY}/archive/${SHORT}.tar.gz"
+          tar xzf /tmp/repo.tar.gz -C buildctx --strip-components=1
+          wget -qO- https://download.docker.com/linux/static/stable/x86_64/docker-27.3.1.tgz \
+            | tar xz --strip-components=1 -C "${HOME}/bin" docker/docker
+          export PATH="${HOME}/bin:${PATH}"
+          echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" -u "${REGISTRY_USER}" --password-stdin
+          IMAGE="${REGISTRY}/${IMAGE_NAME}"
+          docker build -f buildctx/Containerfile -t "${IMAGE}:latest" -t "${IMAGE}:main-${SHORT}" buildctx
+          docker push "${IMAGE}:latest"
+          docker push "${IMAGE}:main-${SHORT}"
+          echo "pushed ${IMAGE}:latest and ${IMAGE}:main-${SHORT}"
+
+      - name: Report immutable digest
+        run: |
+          set -eu
+          export PATH="${HOME}/bin:${PATH}"
+          IMAGE="${REGISTRY}/${IMAGE_NAME}"
+          SHORT="${GITHUB_SHA:0:7}"
+          docker inspect --format='{{index .RepoDigests 0}}' "${IMAGE}:main-${SHORT}"