bench(drive): add worst-case document count query fixture

[QuantumExplorer]

Summary

• add a Criterion bench target for expensive document-count query shapes
• build a cached GroveDB fixture through normal Drive contract/document insertion paths, defaulting to 2,000,000 rows
• cover 100-branch In proof, 100 aggregate range-count fan-out, and compound In+range grouped no-proof/proof paths

Fixture knobs

• DASH_PLATFORM_COUNT_BENCH_ROWS controls row count, default 2,000,000
• DASH_PLATFORM_COUNT_BENCH_DB controls the cached fixture directory
• DASH_PLATFORM_COUNT_BENCH_REBUILD=1 forces rebuild
• DASH_PLATFORM_COUNT_BENCH_BATCH_SIZE controls rows per insert transaction, default 10,000

Validation

• cargo check -p drive --benches
• DASH_PLATFORM_COUNT_BENCH_ROWS=1000 cargo bench -p drive --bench document_count_worst_case -- --warm-up-time 0.1 --measurement-time 0.1

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/bench-expensive-count-queries

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[thepastaclaw]

Review Gate

Commit: 9ba6a0a4

• ✅ Debounce: 206m ago (need 30m)

• ⏳ CI checks: build failure: PR title

• ✅ CodeRabbit review: comment found

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[QuantumExplorer]

Approved