Perf: dedupe import resolution

[longlho]

Summary

• dedupe duplicate import, dynamic import, glob, member-use, and re-export records after parsing
• group static imports by source during graph inspection so each source resolves once per file

Benchmark

• Kibana profiled run: total 14.68s -> 11.48s; graph inspect 7.31s -> 5.88s; resolver calls 1,789,125 -> 1,035,474
• Kibana one-shot benchmark: codescythe 13,160ms; knip 34,506ms
• Kibana Codescythe-only benchmark: 12,286.5ms +/-3.25% over 5 samples, 1 warmup

Tests

• bazel test //crates/codescythe:codescythe_test //benchmarks:kibana_fixture_test
• git diff --check