v0.1.6 - Level 2 latency benchmark + get_dependencies fix

What's new in v0.1.6

Level 2 latency benchmark

• benchmarks/run_latency_benchmark.py: measures p50/p95/p99 query latency with warmup runs
• Engine held open across all tasks — times pure query latency, not indexing overhead
• Results on psf/requests v2.32.3 (20 reps, 3 warmup discarded):
  • get_context p50=1.2ms, p95=1.8ms
  • get_callers p50=1.2ms, p95=1.8ms
  • get_impact p50=2.0ms, p95=3.4ms
  • get_dependencies p50=3.8ms, p95=5.1ms (after fix)
  • Overall p50=1.9ms, p95=2.5ms

All queries under 5ms p95 — noise relative to LLM API latency (500-3000ms).

Performance fix: get_dependencies

• Was doing SELECT * FROM symbols (full table scan) on every call
• Fixed with SELECT DISTINCT name WHERE kind != 'import' (name-only projection)
• Latency dropped from 10.7ms to 3.8ms p50 on the requests corpus (64% faster)
• All 341 tests pass