## What
Introduces the run-store routing seam and the run-engine read seams that
let run lifecycle operations be dispatched to either the control-plane
database or a separately-generated run-ops database, depending on where
a run/batch resides.
- **run-store** (`internal-packages/run-store`): adds `runOpsStore.ts`
and substantially expands `PostgresRunStore.ts` so the store can resolve
residency and route reads/writes to the correct backing client.
`types.ts` grows the routing/residency types; `NoopRunStore.ts` is
removed.
- **run-engine** (`internal-packages/run-engine`): adds
`engine/controlPlaneResolver.ts` and routes the per-system read paths
(dequeue, enqueue, waitpoint, checkpoint, run-attempt, ttl, delayed-run,
execution-snapshot, pending-version, debounce, batch) through the
resolver/store instead of talking to a single Prisma client directly.
`engine/errors.ts`, `engine/types.ts`, and `engine/index.ts` are
extended to support injecting the store/resolver.
Three fixes are included on top of the seam work:
- `c6cadd85f` — routes read-your-writes to the owning store's
**writer**, not its lagging replica, so an operation immediately reading
back what it just wrote sees a consistent result.
- `05c912e05` — normalizes run-ops-generation Prisma errors to the
control-plane error class at the store **write boundary**, so
`instanceof` checks and the `P2002` → 422 handling continue to work
across the separately-generated run-ops Prisma client.
- `88d12907f` — resolves NEW-resident batches in
`ApiBatchResultsPresenter` by routing the batch read through the store,
so a dedicated-DB batch resolves instead of returning 404.
The change is heavily test-first: the bulk of the diff is new
unit/integration coverage for the store routing, residency, and each
run-engine system's control-plane resolver path.
## Why
PR4 of the run-ops split stack (PR1–PR3 land the ClickHouse
test-container and earlier plumbing). This PR is the read-path
foundation: it adds the seam and read-routing but leaves the write path
to route through the same seam in a later PR. Behavior-changing where
the three fixes above touch existing read-your-writes /
error-normalization / batch-resolution paths; otherwise additive (new
store module, new resolver, injectable dependencies with existing
single-client behavior preserved when no dedicated store is configured).
## Tests
Extensive new vitest coverage under `run-store/src/*.test.ts` (routing,
residency, dual-schema select, cross-generation error normalization,
read-after-write, idempotency dedup, mixed residency, waitpoint
co-location) and `run-engine/src/engine/**/*.test.ts` (per-system
`controlPlaneResolver` tests, injectability, block-edge residency,
waitpoint read residency, trigger-create routing, lifecycle router).
Testcontainers-backed; no mocks.
## Notes
Draft, **stacked on #4114** (`runops/pr03-clickhouse-tc`). Review that
first; this diff is against it.
Server-change / changeset note to be added at stack-assembly time.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Daniel Sutton
c266e96c87