agent: unify listening and dialing with directed mutual measurements

Replace Probe with Agent across node runtime, Fleet contracts, backend state, API and storage. Report incoming sessions and outgoing link health through each Agent uplink, and retain directed link controls and retry.

Update protocol fixtures and end-to-end coverage for the unified model; accept requested cancellation during the Fleet timeout test cleanup.

backend/shared/MoShiro.Measurement/Merging/ChunkFinalizer.cs

@@ -5,11 +5,11 @@ using MoShiro.Protocol;
 namespace MoShiro.Measurement;
 
 /// <summary>Agent 单调时钟（微秒）与 UTC（毫秒）的对应关系：块头里的时钟锚点。</summary>
-public readonly record struct ClockAnchor(long AgentMonoUs, long UtcMs);
+public readonly record struct ClockAnchor(long ListenerMonoUs, long UtcMs);
 
 /// <summary>
 /// 给合并好的流盖章：生成完整的块头（任务/测试、参数快照、端口、时钟锚点、起止时间）。
-/// 起止时间由数据本身的时间戳换算得出，而不是取收到列块的时刻，所以不受 Probe 交付延迟的影响。
+/// 起止时间由数据本身的时间戳换算得出，而不是取收到列块的时刻，所以不受拨号方交付延迟的影响。
 /// </summary>
 public static class ChunkFinalizer
 {
@@ -26,7 +26,7 @@ public static class ChunkFinalizer
         ChunkId id)
     {
         RawChunkHeader source = fragment.Header;
-        long offsetUs = source.Clock.ProbeOffsetUs;
+        long offsetUs = source.Clock.DialerOffsetUs;
         long min = long.MaxValue;
         long max = long.MinValue;
         foreach (RawStream stream in streams)
@@ -68,7 +68,7 @@ public static class ChunkFinalizer
             TestId = source.TestId,
             Phase = source.Phase,
             AgentId = agent,
-            ProbeId = source.ProbeId,
+            DialerId = source.DialerId,
             IpVersion = source.IpVersion,
             Target = null,
             Params = new Dictionary<string, JsonElement>(resolvedParams),
@@ -77,15 +77,15 @@ public static class ChunkFinalizer
             StartUtcMs = start,
             DurationMs = duration,
             Partial = false,
-            Clock = new ChunkClock { AgentMonoUs = anchor.AgentMonoUs, UtcMs = anchor.UtcMs, ProbeOffsetUs = offsetUs },
+            Clock = new ChunkClock { ListenerMonoUs = anchor.ListenerMonoUs, UtcMs = anchor.UtcMs, DialerOffsetUs = offsetUs },
         };
         return new RawChunk(header, streams);
     }
 
-    public static long ToUtcMs(long value, ColumnRole role, ClockAnchor anchor, long probeOffsetUs)
+    public static long ToUtcMs(long value, ColumnRole role, ClockAnchor anchor, long dialerOffsetUs)
     {
-        long agentUs = role == ColumnRole.TsProbe ? value + probeOffsetUs : value;
-        long delta = agentUs - anchor.AgentMonoUs;
+        long listenerUs = role == ColumnRole.TsDialer ? value + dialerOffsetUs : value;
+        long delta = listenerUs - anchor.ListenerMonoUs;
         return anchor.UtcMs + (delta >= 0 ? delta / 1000 : -((-delta + 999) / 1000));
     }
 }