v0.6.0

Changelog

• 97feb40 Merge pull request #16 from nao1215/test/atago-e2e-combined-coverage
• 662b452 Merge pull request #17 from nao1215/fix/reject-url-in-check-and-diff
• 92f14c4 Merge pull request #18 from nao1215/release/v0.6.0
• da8dd05 feat(explain): add segment_style_drift, a median per-paragraph drift aggregate
• 4bee946 feat(feature): mask topic tokens so similarity tracks style, not topic
• a5fbbf9 fix(cli): reject URL arguments in check and diff by name
• bc592d1 perf(feature): keep topic masking cheap and stabilize the benchmark gate
• f0f42bf test(cmd): address review feedback on the Debimate regression tests
• 147ab6b test(e2e): add atago E2E suite and fold its coverage into the unit total