tests: run the E2E suite against a standalone Francis runtime

Adds a matrix entry that starts a SQLite-backed Francis runtime next to
Pocket ID and points FRANCIS_HOST at it, so the same Playwright suite runs
with the actor state, alarms, and placement owned by the runtime instead of
embedded in Pocket ID.

The suite needs no changes to work in that topology: the E2E reset seeds
every actor through actors.Service() and deliberately leaves the actor
store alone, so it behaves the same whichever side owns it.

The CLI spec is the exception, since export and import are the two commands
whose behaviour genuinely differs. It now picks the right Compose file,
expects an export to carry no francis.bin, feeds the import an archive
without one, and gains a case asserting that an archive that does carry one
is refused.

The runtime is reached over the Compose network on its UDP port, so nothing
is published to the host, and the cluster CA is left unpinned, which
exercises the same trust-on-first-use path an operator gets without
FRANCIS_CA. Pinning is covered by a unit test instead.

tests/setup/docker-compose-francis.yml

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+# This Docker Compose file is used to set up the environment for the tests.
+# It's the variant where Pocket ID does not embed the Francis actor runtime, but connects to a standalone one instead.
+services:
+  lldap:
+    extends:
+      file: docker-compose.yml
+      service: lldap
+  scim-test-server:
+    extends:
+      file: docker-compose.yml
+      service: scim-test-server
+  francis-runtime:
+    image: ghcr.io/italypaleale/francis:0.1.0-rc.2
+    volumes:
+      - ./francis-config.yaml:/etc/francis/config.yaml:ro
+      - francis-test-data:/data
+    # The image ships its own HEALTHCHECK, which probes the runtime over the loopback
+    # It's repeated here so Pocket ID can wait on it, and so a runtime that never comes up fails fast instead of after the default retries
+    healthcheck:
+      test: ["CMD", "/bin/francis", "healthcheck"]
+      interval: 2s
+      timeout: 5s
+      retries: 15
+      start_period: 5s
+  pocket-id:
+    extends:
+      file: docker-compose.yml
+      service: pocket-id
+    environment:
+      APP_ENV: test
+      ENCRYPTION_KEY: test-encryption-key
+      FILE_BACKEND: ${FILE_BACKEND}
+      # The runtime's port is UDP, since WebTransport runs over HTTP/3
+      FRANCIS_HOST: francis-runtime:7400
+      # Must match "bootstrap.hostPSK" in francis-config.yaml
+      FRANCIS_HOST_PSK: e2e-host-bootstrap-psk-0123456789
+      # FRANCIS_CA is intentionally unset, so this exercises the same trust-on-first-use path an operator gets without it
+      # The cluster only exists inside this Compose network for the duration of the tests
+      #
+      # Peers reach actors placed on this host at ACTORS_HOST, which the runtime hands out, so it has to be the address other containers resolve rather than the default wildcard
+      ACTORS_HOST: pocket-id
+    depends_on:
+      francis-runtime:
+        condition: service_healthy
+
+volumes:
+  pocket-id-test-data:
+  francis-test-data:

tests/setup/francis-config.yaml

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+# Configuration for the standalone Francis runtime used by the "remote Francis" E2E variant.
+# In that variant Pocket ID does not embed the actor runtime: it connects to this one instead, which owns the actor state, placement, and alarms.
+# These secrets are fixed test values and must match the FRANCIS_HOST_PSK passed to Pocket ID in docker-compose-francis.yml.
+
+# The WebTransport server runs over HTTP/3, so this port is UDP
+bind: "0.0.0.0:7400"
+
+# The runtime PSKs derive the cluster CA that signs every workload certificate
+runtimePSKs:
+  - "e2e-runtime-psk-0123456789abcdef"
+
+# Hosts prove they may join by presenting this pre-shared key
+bootstrap:
+  method: psk
+  hostPSK: "e2e-host-bootstrap-psk-0123456789"
+
+# The runtime owns its own SQLite store, which is separate from Pocket ID's database
+# It lives on a volume because the image runs as a non-root user that cannot write to the image filesystem
+provider:
+  connectionString: "/data/francis.db"
+
+# A single Pocket ID replica joins the cluster, matching the cap the embedded runtime applies when HA is off
+maxHosts: 1
+
+log:
+  level: debug