Let the agent set the merge commit title, defaulting to the task title

internal/agents/manager.go

@@ -554,7 +554,7 @@ func (m *Manager) ensureLive(ctx context.Context, sess api.AgentSession, task ap
 		GitName:    creator.GitName,
 		GitEmail:   creator.GitEmail,
 		Guidance:   guidance,
-		MCPServers: []*mcp.Server{{Name: "byre", Version: "0.0.0", Tools: []mcp.Tool{m.askTool(l), m.createTaskTool(l)}}},
+		MCPServers: []*mcp.Server{{Name: "byre", Version: "0.0.0", Tools: []mcp.Tool{m.askTool(l), m.createTaskTool(l), m.setMergeTitleTool(l)}}},
 		Hooks: map[string][]claude.HookMatcher{
 			"UserPromptSubmit": {{Func: remindGuidance}},
 			"Stop":             {{Func: m.bounceProseQuestion(l)}},