Support batch resolution

[phucnguyen1707]

Summary

• resolve multiple names in one invocation while preserving input order
• bound concurrent registry lookups and coalesce normalized duplicates
• keep the existing single-name output shape and report per-name failures
• preserve the merged strict-mode behavior for single and batch lookups

Tests

• npm test (37 tests passing)

Replaces #11, which GitHub would not reopen after the branch was rebased to resolve its conflict with #12.