DB migration (0001_cloud_core_skeleton.sql):
- Add (trace_id, source_event_id) unique index on workbench_trace_events
- Add (trace_id, projected_seq) unique index on workbench_trace_events
- Add workbench_projection_outbox table with BIGSERIAL outbox_seq
Schema (schema.ts):
- Bump CLOUD_RUNTIME_DURABLE_ADAPTER_SCHEMA_VERSION to v5
- Add workbench_projection_outbox to CLOUD_RUNTIME_DURABLE_TABLE_COLUMNS
Runtime store (runtime-store.ts):
- Add persistWorkbenchProjectionOutbox method
- Add readWorkbenchProjectionOutbox method for SSE cursor replay
- Write outbox rows in writeWorkbenchFacts for trace events and terminal turns
- Outbox write errors are logged, not silently swallowed
Trace store (code-agent-trace-store.ts):
- persistTraceEvent no longer uses .catch(() => {}) to swallow errors
- Projection write errors are logged with traceId/sourceEventId for diagnostics
- Sync errors also logged instead of empty catch block
SPEC headers updated to draft-2026-06-20-p1-zero-split-durable-realtime
Closes#1747
Refs #1742
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