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feat(gateway): add AES-256-GCM frame processing behind feature flag (#610)

* feat(gateway): add AES-256-GCM frame processing behind feature flag (#495)

- Add \GatewayAead\ implementing \AeadProvider\ via \es-gcm\ crate
- Feature-gated frame encode/decode using AES-256-GCM
- Existing HMAC path unchanged (default)
- Tests for AES-GCM round-trip and authentication failure

Implements: #495 (Phase 5, gateway layer — additive)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review findings: remove unused import, deduplicate AEAD handlers, add integration tests

- Remove unused Sha256Provider import in ead.rs test module
- Extract handle_wake_core, handle_get_chunk_core, handle_app_data_core
  shared helpers so HMAC and AEAD handler variants share all business logic
  (fixes missing GW-1300 AC4 and GW-1308 AC1 logging in AEAD path)
- Add ead_engine.rs integration tests (feature-gated under es-gcm-codec):
  WAKE round-trip, wrong-PSK discard, tampered-frame discard, PEER_REQUEST
  rejection, unknown key_hint discard

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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