chore: initial sanitized public snapshot

docs/perf/README.md

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+# Performance Evidence
+
+Performance evidence starts here. This directory records benchmark design notes and measured results.
+
+As of the Phase 3 Cargo-native workflow push, the canonical report-refresh
+entrypoint is:
+
+```powershell
+rtk cargo run --manifest-path .\xtask\Cargo.toml -- perf collect-local-comparison
+```
+
+`scripts/perf/collect_local_comparison.ps1` remains available as a thin
+compatibility shim for existing local workflows.
+
+Current active performance evidence files:
+
+- `optimization-ranking.md`
+- `rpc-pressure-evidence.md`
+- `criterion-benchmarks.md`
+- `local-comparison.md`
+- `size-evidence.md`