Give the work queue its own Redis root, and pin what the suite runs as

The queue shared the `pipeline:` prefix with flow state, so `RedisState.clear()`
could DEL the queue stream and `keys()` enumerated queue entries — only callers
filtering `__`-prefixed names kept it safe. It moves to `queue:` without a
migration: whatever is in flight at the upgrade is dropped once, documented in
DEPLOY.md rather than papered over.

Alongside it: `pool_pre_ping`, so a connection idle across a Postgres restart
costs a round trip instead of a failed request; the test suite pins
ENVIRONMENT=local and DOMAIN=localhost itself rather than inheriting a
deployment's .env; and `depth` leaves the queue stats, where it reported the
capped journal length as if it were a backlog.

ALERTS_FILE and PANELS_FILE now point at /data. They defaulted to a path on no
volume, so alert routing and every wall-panel pairing were living in the
container's writable layer and vanishing on each rebuild. Carrying the existing
files across is a manual step; DEPLOY.md has it.

development.md was still the upstream template — compose.override.yml,
localhost.tiangolo.com, `docker compose watch` as the dev flow — and said
nothing about the Playwright suite. Rewritten against what the Makefiles
actually do. deployment.md was template text too, duplicating the root
DEPLOY.md, and is gone.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uq8mtNb97A7praJLyeEYgs

docker/compose.yml

@@ -154,6 +154,11 @@ services:
       # credential and the key it pinned, so losing it on a rebuild would mean
       # enrolling again by hand. Absent until someone connects a portal.
       - CLOUD_CONFIG_FILE=/data/cloud.json
+      # Alert routing and the wall-panel pairings. Both are written at runtime,
+      # so off the volume they would land in the container's writable layer and
+      # be lost on the next rebuild — un-pairing every screen.
+      - ALERTS_FILE=/data/alerts.json
+      - PANELS_FILE=/data/panels.json
 
     volumes:
       - app-flow-data:/data