Fix Vitest command in GitHub Actions

[anthuanvasquez]

Context

Current CI test job executes pnpm test run, which resolves to vitest run run and fails with No test files found.

Problem

The pipeline reports false negatives even when tests pass locally with pnpm test.

Proposed Solution

• Update .github/workflows/ci.yml test command to use pnpm test (or explicit vitest run).
• Keep lint/test jobs aligned with local developer commands.
• Validate workflow in a PR run before merge.

Acceptance Criteria

• CI test job uses a valid command
• PR run completes successfully
• No regressions in lint/test steps

Notes

This is blocking confidence in all upcoming stabilization changes.