✨ add wasm coverage and trace context

benchmarks/README.md

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+# BitLogger Benchmarks
+
+Run the native baseline from the repository root:
+
+```powershell
+moon bench benchmarks --target native --release --deny-warn
+```
+
+The suite measures callback emission, trace-context field binding, synchronous queue enqueue-and-flush, and native file writes. It intentionally has no pass/fail threshold: compare results only on the same machine, toolchain, target, and power profile.
+
+Async throughput remains lifecycle-sensitive and is exercised by the native integration test rather than mixed into these synchronous microbenchmarks. Record its end-to-end measurements separately when profiling an application workload.