settings: Remove unused stream_edits setting in agent (#40640)

This setting is unused (we always stream edits)

Release Notes:

- N/A

assets/settings/default.json

@@ -884,8 +884,6 @@
     // Note: This setting has no effect on external agents that support permission modes, such as Claude Code.
     //       You can set `agent_servers.claude.default_mode` to `bypassPermissions` to skip all permission requests.
     "always_allow_tool_actions": false,
-    // When enabled, the agent will stream edits.
-    "stream_edits": false,
     // When enabled, agent edits will be displayed in single-file editors for review
     "single_file_review": true,
     // When enabled, show voting thumbs for feedback on agent edits.

crates/agent_settings/src/agent_settings.rs

@@ -41,7 +41,6 @@ pub struct AgentSettings {
     pub always_allow_tool_actions: bool,
     pub notify_when_agent_waiting: NotifyWhenAgentWaiting,
     pub play_sound_when_agent_done: bool,
-    pub stream_edits: bool,
     pub single_file_review: bool,
     pub model_parameters: Vec<LanguageModelParameters>,
     pub preferred_completion_mode: CompletionMode,
@@ -174,7 +173,6 @@ impl Settings for AgentSettings {
             always_allow_tool_actions: agent.always_allow_tool_actions.unwrap(),
             notify_when_agent_waiting: agent.notify_when_agent_waiting.unwrap(),
             play_sound_when_agent_done: agent.play_sound_when_agent_done.unwrap(),
-            stream_edits: agent.stream_edits.unwrap(),
             single_file_review: agent.single_file_review.unwrap(),
             model_parameters: agent.model_parameters,
             preferred_completion_mode: agent.preferred_completion_mode.unwrap().into(),

crates/eval/runner_settings.json

@@ -1,7 +1,6 @@
 {
   "assistant": {
     "always_allow_tool_actions": true,
-    "stream_edits": true,
     "version": "2"
   }
 }

crates/settings/src/settings_content/agent.rs

@@ -68,10 +68,6 @@ pub struct AgentSettingsContent {
     ///
     /// Default: false
     pub play_sound_when_agent_done: Option<bool>,
-    /// Whether to stream edits from the agent as they are received.
-    ///
-    /// Default: false
-    pub stream_edits: Option<bool>,
     /// Whether to display agent edits in single-file editors in addition to the review multibuffer pane.
     ///
     /// Default: true