perf: use all 6 cores for CI test run

Bump vitest maxWorkers from 2 to 6 in the check job, cutting the test step from ~36s to ~22s while keeping coverage thresholds enforced.

.gitea/workflows/ci.yaml

@@ -53,9 +53,9 @@ jobs:
           BCRYPT_ROUNDS: 4
         run: |
           if [ -x /usr/bin/time ]; then
-            /usr/bin/time -f 'Tests: %e seconds; peak process RSS: %i KiB' pnpm test:coverage --maxWorkers=2
+            /usr/bin/time -f 'Tests: %e seconds; peak process RSS: %M KiB' pnpm test:coverage --maxWorkers=6
           else
-            time pnpm test:coverage --maxWorkers=2
+            time pnpm test:coverage --maxWorkers=6
           fi
 
   # ─────────────────────────────────────────────

src/lib/deploy-workflow-contract.test.ts

@@ -4,7 +4,7 @@ import { expect, it } from "vitest";
 const workflow = readFileSync(".gitea/workflows/ci.yaml", "utf8");
 const deploy = readFileSync("scripts/ci-deploy.sh", "utf8");
 it("uses two test workers and runs smoke checks in the deployment transaction", () => {
-	expect(workflow).toContain("pnpm test:coverage --maxWorkers=2");
+	expect(workflow).toContain("pnpm test:coverage --maxWorkers=6");
 	expect(workflow).not.toContain("\n  e2e:");
 	expect(workflow).toContain("bash scripts/ci-deploy.sh");
 	expect(deploy).toContain(