Rename 'agents' field to 'participants' in bridge events

Field Name Update:
- Changed ConversationStartedData.Agents to Participants
- Updated JSON tag from "agents" to "participants"
- Matches backend API schema expectations

Context:
- Backend expects 'participants' field, not 'agents'
- This ensures full agent details (name, model, prompt, cli_version)
  are properly stored and returned by the backend
- Previously backend was only showing participant names as strings

Testing:
- Updated all test cases to use 'participants' field
- Updated test assertions to check "participants" instead of "agents"
- All tests passing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: kevinelliott

internal/bridge/client_test.go

@@ -111,7 +111,7 @@ func TestSendEvent_Success(t *testing.T) {
 			ConversationID: "test-123",
 			Mode:           "round-robin",
 			InitialPrompt:  "Test",
-			Agents:         []AgentParticipant{},
+			Participants:   []AgentParticipant{},
 			SystemInfo:     SystemInfo{},
 		},
 	}

internal/bridge/emitter.go

@@ -44,7 +44,7 @@ func (e *Emitter) EmitConversationStarted(
 			Mode:           mode,
 			InitialPrompt:  initialPrompt,
 			MaxTurns:       maxTurns,
-			Agents:         agents,
+			Participants:   agents,
 			SystemInfo:     e.systemInfo,
 		},
 	}

internal/bridge/events.go

@@ -51,7 +51,7 @@ type ConversationStartedData struct {
 	Mode           string             `json:"mode"`
 	InitialPrompt  string             `json:"initial_prompt"`
 	MaxTurns       int                `json:"max_turns,omitempty"`
-	Agents         []AgentParticipant `json:"agents"`
+	Participants   []AgentParticipant `json:"participants"`
 	SystemInfo     SystemInfo         `json:"system_info"`
 }
 

internal/bridge/events_test.go

@@ -36,7 +36,7 @@ func TestEventJSONSerialization(t *testing.T) {
 			Mode:           "round-robin",
 			InitialPrompt:  "Hello agents",
 			MaxTurns:       10,
-			Agents:         agents,
+			Participants:   agents,
 			SystemInfo:     sysInfo,
 		},
 	}
@@ -82,19 +82,19 @@ func TestEventJSONSerialization(t *testing.T) {
 		}
 	}
 
-	// Verify agents array is present and has cli_version
-	agentsArray, ok := dataMap["agents"].([]interface{})
-	if !ok || len(agentsArray) == 0 {
-		t.Fatal("Expected agents to be a non-empty array")
+	// Verify participants array is present and has cli_version
+	participantsArray, ok := dataMap["participants"].([]interface{})
+	if !ok || len(participantsArray) == 0 {
+		t.Fatal("Expected participants to be a non-empty array")
 	}
 
-	agentMap, ok := agentsArray[0].(map[string]interface{})
+	participantMap, ok := participantsArray[0].(map[string]interface{})
 	if !ok {
-		t.Fatal("Expected first agent to be an object")
+		t.Fatal("Expected first participant to be an object")
 	}
 
-	if agentMap["cli_version"] != "1.2.0" {
-		t.Errorf("Expected cli_version=1.2.0, got %v", agentMap["cli_version"])
+	if participantMap["cli_version"] != "1.2.0" {
+		t.Errorf("Expected cli_version=1.2.0, got %v", participantMap["cli_version"])
 	}
 }
 
@@ -292,7 +292,7 @@ func TestTimestampFormat(t *testing.T) {
 			ConversationID: "test",
 			Mode:           "round-robin",
 			InitialPrompt:  "test",
-			Agents:         []AgentParticipant{},
+			Participants:   []AgentParticipant{},
 			SystemInfo:     SystemInfo{},
 		},
 	}