feat: add initial

Signed-off-by: kjuulh <contact@kjuulh.io>

todos/SQ-025-compression-performance.md

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+# SQ-025: Compression & Performance Tuning
+
+**Status:** `[ ] TODO`
+**Blocked by:** SQ-024
+**Priority:** Low
+
+## Description
+
+Add zstd compression to S3 segment shipping and create a benchmark suite.
+
+## Files to Create/Modify
+
+- `crates/sq-storage/src/object_store/shipper.rs` - add zstd compression
+- `crates/sq-storage/src/object_store/reader.rs` - add zstd decompression
+- `crates/sq-storage/benches/` - throughput benchmarks
+
+## Benchmarks
+
+- Write throughput: messages/sec at various payload sizes
+- Read throughput: messages/sec sequential scan
+- Compression ratio: raw vs compressed segment size
+- S3 round-trip: write, ship, trim, read from S3
+
+## Acceptance Criteria
+
+- [ ] Compressed segments round-trip correctly (write -> compress -> upload -> download -> decompress -> read)
+- [ ] Compression ratio metrics are logged
+- [ ] Benchmarks produce readable output
+- [ ] No correctness regressions (all existing tests still pass)