test: add NDJSON edge case coverage

[membphis]

Summary

Closes #154.

Add systematic edge case coverage for scenarios that are qjson's responsibility when parsing individual NDJSON records.

Changes

• Add tests/ndjson_edge_cases.rs with 7 test cases:
  • BOM handling (3 tests): UTF-8 BOM rejection per RFC 8259 §8.1
  • Large records (2 tests): 1MB and 2MB single-record stress tests
  • Batch processing (2 tests): 10K+ parse/free cycles to catch memory leaks

What's NOT covered (caller responsibility)

• Empty lines / whitespace-only lines → caller's split logic
• CRLF vs LF handling → caller's line trimming
• Error recovery across records → caller decides whether to continue

Testing

cargo test --release --test ndjson_edge_cases
make lint
make test

All 7 new tests pass in both EAGER and LAZY modes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 7b5e328e-5541-4e15-a3c1-58e7bed65b3c

📥 Commits

Reviewing files that changed from the base of the PR and between 83c26ad and f36fca2.

📒 Files selected for processing (1)

• tests/ndjson_edge_cases.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/ndjson-edge-cases-154

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