Network 层的迁移与强化已完成，TODO.md 与 MobaSyncMVP.md 给出后续方向

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+## MODIFIED Requirements
+
+### Requirement: Heartbeat is limited to liveness, RTT, and time sync
+The shared session lifecycle SHALL treat heartbeat traffic as infrastructure input for liveness detection and round-trip-time measurement only. Clock-synchronization samples MUST be forwarded to a separate sync-strategy component rather than being owned by `SessionManager`, and heartbeat processing MUST NOT itself own login success, login failure, or reconnect policy decisions.
+
+#### Scenario: Heartbeat updates liveness and RTT while forwarding clock samples
+- **WHEN** a heartbeat response is received for an active session
+- **THEN** the session manager updates last-seen or timeout bookkeeping and RTT data
+- **THEN** any server-tick sample is forwarded to the clock-sync strategy without making heartbeat the owner of login state
+
+#### Scenario: Missing heartbeat triggers timeout state
+- **WHEN** the configured heartbeat timeout elapses without a required heartbeat or other liveness signal
+- **THEN** the session lifecycle transitions the session into a timed-out state
+- **THEN** reconnect handling is delegated to the lifecycle reconnect policy rather than hidden inside the heartbeat handler itself