v3 (engine V1) is end-of-lifed and the v3 clusters are gone, so this
removes the dead v3 execution code from the monorepo. It's the first
pass of TRI-11824 - the webapp v3 code paths are deliberately left
untouched and gated for a follow-up.
## Apps
Deletes the three v3-only execution apps and their build wiring:
- `apps/coordinator`, `apps/kubernetes-provider`, `apps/docker-provider`
- `.github/workflows/publish-worker.yml` - it built only those three;
the v4 worker publish is a separate workflow
- Their references in `.changeset/config.json`, `.cursorignore`,
`CHANGESETS.md`, `CONTRIBUTING.md`, `.server-changes/README.md`
- `pnpm-lock.yaml` regenerated to prune the apps and their app-only
dependencies (`socket.io`, `@kubernetes/client-node`, `p-queue`,
`execa`, `prom-client`, `tinyexec`)
## Core
Removes the helpers in `@trigger.dev/core` that only those apps used -
`ProviderShell`, `SimpleLogger`, the `Exec`/process helpers,
`isExecaChildProcess`, `getTextBody`, and `testDockerCheckpoint`. Each
was verified to have no remaining consumers anywhere in the repo.
Kept the helpers still used elsewhere: `ExponentialBackoff` (warm-start
client), `HttpReply`/`getJsonBody` (serverOnly http server),
`SimpleStructuredLogger` (widely used), and
`ZodNamespace`/`ZodSocketConnection` (still referenced by legacy v3
webapp code, hence the follow-up pass).
The `./v3/apps` and `./v3/serverOnly` export subpaths remain - only dead
members were trimmed from their barrels, so no `package.json` exports
changed.
## Verification
`@trigger.dev/core` builds, and `typecheck` passes for core, supervisor,
cli-v3, run-engine, redis-worker, and webapp.
refs TRI-11824
* cursor should ignore .env files
* fix for duplicate builds when starting dev
* output metafile in dev
* attach metafile to background worker
* attach import timings to worker manifest
* warn during dev if imports take more than 1s
* add analyze command
* update disable warnings flag message
* add changeset
nicktrn