Fix mutation seed runner loading

[joesobo]

Summary

• wrap the mutation seed runner in an async main function so tsx does not need top-level await support
• add a regression test that proves the script loads through tsx before validating required flags

Root cause

The merged mutation seed workflow calls pnpm exec tsx scripts/mutation/runSeedJob.ts. That script used top-level await, and tsx/esbuild transformed it as CommonJS in CI, failing before quality-tools or Stryker started. This is a CodeGraphy CI wrapper issue, not a quality-tools package integration issue.

Validation

• pnpm --filter @codegraphy-dev/extension exec vitest run --config vitest.config.ts tests/extension/mutation/seedJobs.test.ts
• pnpm exec tsx scripts/mutation/runSeedJob.ts
• pnpm exec tsx scripts/mutation/runSeedJob.ts --package plugin-python --shard missing-shard
• pnpm run typecheck
• pnpm run lint

I did not run a real mutation shard locally because the failure happened before Stryker starts and full mutation is intentionally expensive.

[changeset-bot]

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Latest commit: 729bbf8

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