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/tests/MoShiro.Protocol.Tests/CatalogTests.cs

@@ -99,7 +99,7 @@ public sealed class CatalogTests
         {
             Version = 7,
             Tasks = [new TaskSpec { Id = new TaskId("tsk_1"), Kind = "udp_echo", Params = new Dictionary<string, JsonElement> { ["rate_hz"] = Json("10") } }],
-            Peers = [new PeerSpec { ProbeId = new ProbeId("prb_1"), PublicKey = "AAAA" }],
+            Peers = [new PeerSpec { NodeId = new Fleet.Core.NodeId("agt_1"), PublicKey = "AAAA" }],
         };
         string text = JsonSerializer.Serialize(set, MoShiroJsonContext.Default.TaskSet);
         TaskSet back = JsonSerializer.Deserialize(text, MoShiroJsonContext.Default.TaskSet)!;
@@ -108,14 +108,14 @@ public sealed class CatalogTests
         Assert.Equal(7, back.Version);
         Assert.Equal("tsk_1", back.Tasks[0].Id.Value);
         Assert.Equal(10, back.Tasks[0].Params["rate_hz"].GetInt64());
-        Assert.Equal("prb_1", back.Peers[0].ProbeId.Value);
+        Assert.Equal("agt_1", back.Peers[0].NodeId.Value);
     }
 
     [Fact]
-    public void AgentEnrollMeta_ToleratesUnknownFields_AndKeepsDefaults()
+    public void NodeEnrollMeta_ToleratesUnknownFields_AndKeepsDefaults()
     {
-        AgentEnrollMeta meta = JsonSerializer.Deserialize("{\"kinds\":[\"udp_echo\"],\"future\":1}", MoShiroJsonContext.Default.AgentEnrollMeta)!;
-        Assert.Equal(7443, meta.ProbeTcpPort);
+        NodeEnrollMeta meta = JsonSerializer.Deserialize("{\"kinds\":[\"udp_echo\"],\"future\":1}", MoShiroJsonContext.Default.NodeEnrollMeta)!;
+        Assert.Equal(0, meta.TcpPort); // 没有端口表示这个节点不监听
         Assert.Equal(["udp_echo"], meta.Kinds);
     }
 

backend/shared/tests/MoShiro.Protocol.Tests/NodeRuntimeStatusTests.cs

@@ -7,11 +7,11 @@ public sealed class NodeRuntimeStatusTests
     [Fact]
     public void HeartbeatStatus_UsesStableSnakeCaseEnumValues()
     {
-        var heartbeat = new AgentHeartbeatExtra { RuntimeStatus = NodeRuntimeStatus.ProbePaused };
-        string json = JsonSerializer.Serialize(heartbeat, MoShiroJsonContext.Default.AgentHeartbeatExtra);
+        var heartbeat = new NodeHeartbeatExtra { RuntimeStatus = NodeRuntimeStatus.Idle };
+        string json = JsonSerializer.Serialize(heartbeat, MoShiroJsonContext.Default.NodeHeartbeatExtra);
 
-        Assert.Contains("\"runtime_status\":\"probe_paused\"", json, StringComparison.Ordinal);
-        Assert.Equal(NodeRuntimeStatus.ProbePaused,
-            JsonSerializer.Deserialize(json, MoShiroJsonContext.Default.AgentHeartbeatExtra)!.RuntimeStatus);
+        Assert.Contains("\"runtime_status\":\"idle\"", json, StringComparison.Ordinal);
+        Assert.Equal(NodeRuntimeStatus.Idle,
+            JsonSerializer.Deserialize(json, MoShiroJsonContext.Default.NodeHeartbeatExtra)!.RuntimeStatus);
     }
 }

backend/shared/tests/MoShiro.Protocol.Tests/RawChunkCodecTests.cs

@@ -9,17 +9,17 @@ namespace MoShiro.Protocol.Tests;
 public sealed class RawChunkCodecTests
 {
     [Fact]
-    public void Header_LegacyDefaultsToIpv4_AndIpv6RoundTripsToAnIndependentSeries()
+    public void Header_DefaultsToIpv4_AndIpv6RoundTripsToAnIndependentSeries()
     {
-        RawChunkHeader legacy = System.Text.Json.JsonSerializer.Deserialize("{\"probe_id\":\"prb_legacy\"}", MoShiroJsonContext.Default.RawChunkHeader)!;
+        RawChunkHeader legacy = System.Text.Json.JsonSerializer.Deserialize("{\"dialer_id\":\"agt_legacy\"}", MoShiroJsonContext.Default.RawChunkHeader)!;
         Assert.Equal(IpVersions.V4, legacy.IpVersion);
-        Assert.Equal("line:prb_legacy", legacy.Series);
+        Assert.Equal("line:agt_legacy", legacy.Series);
         RawChunk chunk = SampleChunk();
-        chunk.Header.ProbeId = new ProbeId("prb_dual");
+        chunk.Header.DialerId = new Fleet.Core.NodeId("agt_dual");
         chunk.Header.IpVersion = IpVersions.V6;
         RawChunk decoded = RawChunkCodec.Decode(RawChunkCodec.Encode(chunk)).Value;
         Assert.Equal("ipv6", decoded.Header.IpVersion);
-        Assert.Equal("line:prb_dual:ipv6", decoded.Header.Series);
+        Assert.Equal("line:agt_dual:ipv6", decoded.Header.Series);
         Assert.Equal(chunk.Find("msg")!.Count, decoded.Find("msg")!.Count);
     }
 
@@ -42,7 +42,7 @@ public sealed class RawChunkCodecTests
 
         Assert.Equal(original.Header.ChunkId, decoded.Header.ChunkId);
         Assert.Equal("udp_echo", decoded.Header.Kind);
-        Assert.Equal(original.Header.Clock.ProbeOffsetUs, decoded.Header.Clock.ProbeOffsetUs);
+        Assert.Equal(original.Header.Clock.DialerOffsetUs, decoded.Header.Clock.DialerOffsetUs);
         RawStream before = original.Find("msg")!;
         RawStream after = decoded.Find("msg")!;
         Assert.Equal(before.Count, after.Count);
@@ -93,7 +93,7 @@ public sealed class RawChunkCodecTests
     {
         // 布局变化（列编码、头部字段、字节序）会让这个测试失败：必须同时升级 container_version 并更新黄金字节。
         RawChunk chunk = SampleChunk();
-        chunk.Header.Clock = new ChunkClock { AgentMonoUs = 1000, UtcMs = 1_700_000_000_000, ProbeOffsetUs = 500 };
+        chunk.Header.Clock = new ChunkClock { ListenerMonoUs = 1000, UtcMs = 1_700_000_000_000, DialerOffsetUs = 500 };
         byte[] body = RawChunkCodec.EncodeBody(chunk);
         uint headerLength = BinaryPrimitives.ReadUInt32LittleEndian(body);
         string columns = Convert.ToHexStringLower(body.AsSpan(4 + (int)headerLength));