A data race was identified in the lazy initialization of the RSA and PGP services within the `crypt` package. The non-thread-safe `if s.service == nil` check could lead to multiple initializations when accessed concurrently.
This commit resolves the race condition by using `sync.Once` to ensure that the initialization for each service is performed exactly once, making the `Service` struct safe for concurrent use.
Additionally, a new test file, `race_test.go`, has been added to provide a regression test for this specific scenario.
A new file, `AUDIT-CONCURRENCY.md`, has been created to document the findings of the concurrency audit, the remediation steps taken, and the verification process.
Co-authored-by: Snider <631881+Snider@users.noreply.github.com>
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