feat: Benchmark Query Shapes Across Backends - #17
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Seed a follow-ring, time point get, author timeline, fan-in feed, keyset page, and publish, then emit a percentile comparison table so later stores drop in on the same workload.
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Closes #16
The ActivityStore port now has a shared microbenchmark. It seeds a follow-ring, times point get, author timeline, fan-in home feed, keyset page, and publish, then prints a markdown table of nearest-rank p50/p95/p99 plus relative p50. Writes go to a dedicated writer user so the read shapes stay stable across iterations.
Memory and PGlite both run through the same harness in the test suite. Later backends drop in by implementing the port and calling compareStores.