Bump smoke-tests to vitest 4 to drop the worker rpc timeout flake

[theoephraim]

What

• smoke-tests: vitest ^3.2.4 -> ^4.0.18 (matches the root catalog)
• Drop the esbuild.tsconfigRaw block from smoke-tests/vitest.config.ts
• Add helpers/**/*.ts and vitest.config.ts to the smoke-tests/tsconfig.json include set

Why

The ubuntu smoke job on the release PR failed with an unhandled [vitest-worker]: Timeout calling "onTaskUpdate" error even though all 168 tests passed (https://github.com/dmno-dev/varlock/actions/runs/33596804177/job/100142117083).

vitest 3 gives the worker-to-main rpc a 60s timeout. The smoke suite blocks its worker with long spawnSync calls (Rust/C#/Java builds in lang-modules.test.ts) while the main thread is busy with other files, so the reply can arrive after the deadline. vitest 4 sets that rpc timeout to -1, which removes this flake class.

vite 8 (pulled in by vitest 4) transforms with oxc, so the old esbuild.tsconfigRaw workaround was ignored and only produced a "both esbuild and oxc options were set" warning. Oxc discovers the tsconfig per file and honours include, so sources not covered by tests/** (the helpers/ modules) walked up to the root tsconfig, whose extends target is not installed in the isolated smoke-test pnpm environment. Widening the smoke-tests tsconfig include keeps every transformed source on the self-contained config. Verified locally by pointing the root extends at a nonexistent package and running the full suite.

Full smoke suite passes locally under vitest 4 (17 files, 166 passed, 3 skipped for missing toolchains).

[pullfrog]

Important

The config removal currently prevents the smoke suite from loading on Ubuntu and macOS.

Reviewed changes Reviewed the Vitest 4 dependency upgrade and the associated transform-config cleanup.

• Vitest upgrade: Moves the isolated smoke-test workspace from Vitest 3 to Vitest 4, currently resolving Vitest 4.1.11 with Vite 8.2.2.
• Transform configuration: Removes the previous esbuild-specific tsconfigRaw override now that Vite transforms through Oxc.

  ^{｜ Fix all ➔ ｜ Fix 👍s ➔ ｜ View workflow run ｜ Using azure/gpt-5.6-sol ｜ 𝕏}

[pullfrog]

✅ No new issues found.

Reviewed changes Reviewed the follow-up fix added since the prior Pullfrog review.

• Smoke-test tsconfig coverage: Added the imported helper modules and vitest.config.ts to the isolated smoke-test config, preventing Oxc from falling through to the unavailable root tsconfig.

  ^{｜ View workflow run ｜ Using azure/gpt-5.6-sol ｜ 𝕏}