fix(test): add 3.9.2 native full-build to KNOWN_REGRESSIONS (#901)

NativeDbProxy overhead causes native full build to regress +81%
(5206ms -> 9403ms). Fix tracked in PR #906. Add to KNOWN_REGRESSIONS
to unblock this benchmark data PR.

Author: carlos-alm

tests/benchmarks/regression-guard.test.ts

@@ -76,13 +76,17 @@ const SKIP_VERSIONS = new Set(['3.8.0']);
  * - 3.9.1:1-file rebuild — continuation of the 3.9.0 regression; native
  *   incremental path still re-runs graph-wide phases on single-file rebuilds.
  *   Benchmark data shows 562 → 767ms (+36%). Same root cause as 3.9.0 entry.
+ *
+ * - 3.9.2:Full build — NativeDbProxy overhead causes native full build to
+ *   regress from 5206ms to 9403ms (+81%). Fix tracked in PR #906.
  */
 const KNOWN_REGRESSIONS = new Set([
   '3.9.0:1-file rebuild',
   '3.9.0:fnDeps depth 1',
   '3.9.0:fnDeps depth 3',
   '3.9.0:fnDeps depth 5',
   '3.9.1:1-file rebuild',
+  '3.9.2:Full build',
 ]);
 
 /**