build(vitest): relocate isolated config to .config/repo/

The isolated vitest config was a migration straggler still at .config/,
while the main config already lives at .config/repo/vitest.config.mts.
Move it to match. Fix the __dirname-relative paths broken by descending
one directory: vitest.coverage.config.mts import, projectRoot (now two
levels up), and the global-setup path. Repoint the CI runner and the
cross-reference comment in vitest.config.mts.

Author: jdalton

.config/vitest.config.isolated.mts .config/repo/vitest.config.isolated.mts.config/vitest.config.isolated.mts renamed to .config/repo/vitest.config.isolated.mts

@@ -8,10 +8,10 @@ import { fileURLToPath } from 'node:url'
 import process from 'node:process'
 import { defineConfig } from 'vitest/config'
 
-import { baseCoverageConfig } from './vitest.coverage.config.mts'
+import { baseCoverageConfig } from '../vitest.coverage.config.mts'
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
-const projectRoot = path.resolve(__dirname, '..')
+const projectRoot = path.resolve(__dirname, '..', '..')
 
 // Worker heap cap: smaller in CI (GitHub Actions ubuntu-latest has
 // ~7 GB total RAM — leave room for the runner + OS), generous locally
@@ -43,7 +43,7 @@ const vitestConfigIsolated = defineConfig({
   },
   test: {
     deps: { interopDefault: false },
-    globalSetup: [path.resolve(__dirname, 'vitest-global-setup.mts')],
+    globalSetup: [path.resolve(__dirname, '..', 'vitest-global-setup.mts')],
     globals: false,
     environment: 'node',
     include: [

.config/repo/vitest.config.mts

@@ -36,4 +36,4 @@ jobs:
         run: pnpm run build
 
       - name: Run isolated tests
-        run: pnpm exec vitest --config .config/vitest.config.isolated.mts run
+        run: pnpm exec vitest --config .config/repo/vitest.config.isolated.mts run