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d0a2078901
## Summary
- **Go layer**: Replace `sync.Once` with recoverable `sync.Mutex` init;
add process-level singleton; set `duration_seconds=7200` (was defaulting
to 15min); add `refreshMu` to deduplicate concurrent STS calls and
prevent data race on `IsExpired()`; validate credential completeness
(AK/SK/Token); add comprehensive logging with masked AK
- **C++ layer**: Default-initialize `STSCallResult.success{false}` (was
UB); validate AK/SK/Token completeness before updating cached
credentials in `Reload()`; mask access key in DEBUG log
related: #48045
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Signed-off-by: MrPresent-Han <chun.han@gmail.com>
Co-authored-by: MrPresent-Han <chun.han@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>