🔖 prepare 0.5.2 release notes

docs/changes/0.5.2.md

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+## BitLogger Update Changes
+
+version 0.5.2
+
+### Docs
+
+- docs: align the README support matrix with the actual CI validation scope for both `BitLogger` and `bitlogger_async`
+
+### Test
+
+- test: add sync config parser failure-path coverage for malformed JSON, wrong field types, and invalid enum values
+- test: add async config parser failure-path coverage for malformed input, wrong async field types, invalid build roots, and nested sync config parse failures
+- test: cover async worker failure reporting and `wait_idle()` early-stop behavior when batch flush fails
+- test: extend CI so `bitlogger_async` native tests run alongside the existing `js` and `wasm-gc` coverage
+
+### Runtime
+
+- runtime: allow async flush callbacks to raise so async worker failure state and `last_error()` reporting are reachable through the public API
+
+### Notes
+
+- this release is a focused validation follow-up that closes the gap between published verification claims and the real test matrix
+- release verification now covers sync checks/tests plus async checks/tests across `native`, `js`, and `wasm-gc`