fix(engine): drop dead working set prompt marker

crates/tui/src/core/engine/context.rs

@@ -40,7 +40,6 @@ const LARGE_CONTEXT_WINDOW_TOKENS: u32 = 500_000;
 const TOOL_RESULT_METADATA_SUMMARY_CHARS: usize = 320;
 
 pub(super) const COMPACTION_SUMMARY_MARKER: &str = "Conversation Summary (Auto-Generated)";
-pub(super) const WORKING_SET_SUMMARY_MARKER: &str = "## Repo Working Set";
 
 #[derive(Debug, Clone, Copy)]
 struct ToolResultContextLimits {

crates/tui/src/core/engine/tests.rs

@@ -1,6 +1,5 @@
 use super::*;
 
-use super::context::WORKING_SET_SUMMARY_MARKER;
 use crate::models::SystemBlock;
 use serde_json::json;
 use std::collections::HashSet;
@@ -9,6 +8,8 @@ use std::path::PathBuf;
 use std::time::Instant;
 use tempfile::tempdir;
 
+const WORKING_SET_SUMMARY_MARKER: &str = "## Repo Working Set";
+
 fn build_engine_with_capacity(capacity: CapacityControllerConfig) -> Engine {
     let engine_config = EngineConfig {
         capacity,