Move API code from user/ to agent/

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

src/user/ui_channel.rs

@@ -11,16 +11,11 @@
 // The channel also fans out to a broadcast channel so the observation
 // socket (observe.rs) can subscribe without touching the main path.
 
-use std::sync::{Arc, RwLock};
+use std::sync::Arc;
 use tokio::sync::{broadcast, mpsc};
 
-/// Shared, live context state — agent writes, TUI reads for the debug screen.
-pub type SharedContextState = Arc<RwLock<Vec<ContextSection>>>;
-
-/// Create a new shared context state.
-pub fn shared_context_state() -> SharedContextState {
-    Arc::new(RwLock::new(Vec::new()))
-}
+// Re-export context types that moved to agent::context
+pub use crate::agent::context::{ContextSection, SharedContextState, shared_context_state};
 
 // ActiveToolCall lives in agent::tools — re-export for TUI access
 pub use crate::agent::tools::ActiveToolCall;
@@ -57,15 +52,6 @@ pub struct StatusInfo {
     pub context_budget: String,
 }
 
-/// A section of the context window, possibly with children.
-#[derive(Debug, Clone)]
-pub struct ContextSection {
-    pub name: String,
-    pub tokens: usize,
-    pub content: String,
-    pub children: Vec<ContextSection>,
-}
-
 /// Context loading details for the debug screen.
 #[derive(Debug, Clone)]
 pub struct ContextInfo {