fix: keep mountpoint credentials out of sandbox commands#3429
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This pull request fixes mountpoint-backed S3/GCS mounts so temporary AWS credentials are no longer embedded directly in the shell command used to invoke
mount-s3.The mountpoint pattern now writes credentials to an owner-only runtime env file under the sandbox workspace, sources that file from a credential-free command, redirects mount output away from exec instrumentation, and redacts known credential values from mount failure stderr before raising
MountCommandError. The sandbox mount tests now cover command construction, credential file writes, failure redaction, and audit-event payloads so access keys, secret keys, and session tokens do not leak through command metadata or error context.ref: #3421