Speeds up and de-flakes the unit-test suite: testcontainers booted once
per vitest worker (per-test isolation kept only where a test runs
background redis work that outlives it), a duration-weighted shard
sequencer so each shard does roughly equal work, the slowest suites
split, two genuine flakes fixed (`streamBatchItems` shared-redis leak;
run-engine waits that relied on fixed sleeps), and transient DockerHub
pulls retried.
**Timings (CI, per-shard wall):** worst unit-test shard ~771s → ~294s;
packages/webapp shards ~250-270s, most internal ~190-240s. All 25 shards
green.
A shard breaks down as ~70s fixed setup (install / image-pull /
generate) + ~70s cold `^build` + the actual container tests. So the
remaining cost is mostly the tests themselves plus that fixed setup.
**Next (separate, timings):**
- **typecheck (~6m24s)** — the slowest check overall; bound by
full-graph `tsc`, not the TS version (a TS6 branch is still ~6m17s). The
real lever is **tsgo** (the Go compiler).
- Possible later: turbo CI caching could trim the ~70s cold build on
*warm* runs, but it's conditional (cold runs rebuild anyway) and doesn't
touch setup or test time — secondary.
`cli-v3` e2e and `sdk-compat` are path-gated (don't run on test-infra
changes) and already comfortably fast.
nicktrn
fa15438e42