9cc9888bb4f03c0c7c6590e2e0457f3b0b7da48a
Replace Deflate+XOR with IronSnappy S2 block compression and ChaCha20-Poly1305 / AES-256-GCM AEAD encryption, matching golang/nats-server/server/filestore.go. Introduces FSV2 envelope format alongside existing FSV1 for backward compatibility. Adds 55 new tests across S2CodecTests, AeadEncryptorTests, and FileStoreV2Tests covering all 6 cipher×compression permutations, tamper detection, and legacy format round-trips.
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C#
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