Summary

• stop forwarding the Anvil silent option so startup logs remain available to the readiness resolver
• remove silent from the public Anvil parameter type
• add a focused regression test that confirms silent is stripped from internal args

Fixes #80.

Verification

• pnpm exec vitest src/instances/anvil.test.ts --run -t "ignores silent option"
• pnpm exec tsc --noEmit
• pnpm exec biome check src/instances/anvil.ts src/instances/anvil.test.ts
• git diff --check

Note: the full anvil integration test file cannot run on this Windows machine because the anvil binary is not installed in PATH; the focused regression test does not require the binary.