Add varlock load step to CI before type checking

The env.d.ts files are gitignored, so varlock needs to load and
generate the typed env schema before tsc can type-check.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: theoephraim

.github/workflows/ci.yaml

@@ -8,6 +8,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
       - run: bun install
+      - run: bunx varlock load
       - run: bun run check
       - run: bun run test