Constant-time internal-auth secret compare (timing oracle)

Shipped: July 8, 2026 at 4:38 AM UTC
Author: Kamo
Commit: fa87b32

Replace String.equals with MessageDigest.isEqual so response latency cannot leak the X-Internal-Auth shared secret byte-by-byte. Fleet-wide sweep of the copy-pasted InternalAuthFilter (same fix already shipped in the eClose and underwriting services).

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