Fixed compilation errors in benchmark test files where `ctx` was
declared twice, preventing benchmarks from running.
Changes:
- internal/storage/sqlite/bench_helpers_test.go: Remove duplicate ctx declaration
- internal/storage/sqlite/compact_bench_test.go: Remove duplicate ctx declaration
This allows `go test -tags=bench` to compile and run successfully.
Related to bd-5qim verification.
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Co-Authored-By: Claude <noreply@anthropic.com>