Phase 3.1 closes the cross-process gap the Phase 3 smoke surfaced —
streaming events (msg_start/thinking/delta/complete/curated) flow
from agent-runner → chamber via valkey pub/sub rather than the
SQLite bridge (too high-volume + ephemeral for the DB).
New service: `althing-valkey` (stock `valkey/valkey:8-alpine`).
Internal-only — no exposed port, no volume. chamber + agent-runner
reach via docker DNS at `valkey:6379` on the compose default
network. healthcheck via `valkey-cli ping` (5s interval). chamber
+ agent-runner gain `depends_on: valkey: service_healthy` so the
bridge is up before either side starts publishing or subscribing.
Forseti unchanged — never publishes Phase 3 events.
Operational properties (per forseti's deployment notes):
- Mixed-state safe at every step. Missing valkey.url config key
→ chamber + runner stay on v3.0 / Phase 2 equivalent paths.
- Backward path is single config-key delete + restart.
- streaming_enabled: true (set on agent-runner 2026-05-17) is
unaffected by this change.
README's services table + playbook header + verify section all
extended to reflect the four-service shape. Forseti's contract
at vh/althing:docs/contracts/phase3_1_valkey_bridge.contract.md
carries the wire-protocol spec.
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