Update REMEDIATION.md to reflect completed benchmark work

go/appencryption/REMEDIATION.md

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+# Asherah Go Implementation - Remediation Guide
+
+This document outlines critical issues found in the Asherah Go implementation that require remediation, organized by severity and impact on high-traffic production systems.
+
+## 🟢 Notable Issues
+
+### 1. Silent Error Swallowing
+**Location**: `envelope.go:221`
+```go
+_ = err // err is intentionally ignored
+```
+
+**Why Fix**:
+- Masks critical infrastructure failures (network, permissions, etc.)
+- Makes debugging production issues nearly impossible
+- Treats all errors as "duplicate key" when they could be systemic
+- No observability into metastore health
+
+**Remediation**:
+- Log errors with appropriate severity
+- Add metrics/monitoring for metastore failures
+- Implement error classification (retriable vs permanent)
+
+**Status**: ✅ **FIXED** - Added warning logging while maintaining existing flow
+
+## Priority Order for Remediation
+
+1. **Lower Priority (Observability)**:
+   - Silent error swallowing (#1) - ✅ **COMPLETED**
+
+## Testing Recommendations
+
+- ✅ **COMPLETED**: Add benchmarks for all hot paths with allocation tracking
+- ✅ **COMPLETED**: Use race detector in all tests (`go test -race`)
+- Implement stress tests with high concurrency
+- Add fuzzing for error path handling
+- Add memory leak detection tests
+
+## Summary
+
+**All critical and high-priority issues have been resolved:**
+- ✅ Nil pointer dereference fixed
+- ✅ Resource leak on close error fixed  
+- ✅ Silent error swallowing improved with logging
+- ✅ Comprehensive benchmarks added with allocation tracking
+- ✅ All tests verified with race detector
+
+**Remaining recommendations are lower priority enhancements for additional robustness.**