feat: enhance subagent context with abort flag and implement tool call timeout

src/app/subagent/context.rs

@@ -2,7 +2,7 @@
 //! including the default read-only tool set for reviewer agents.
 
 use std::path::PathBuf;
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex, atomic::{AtomicBool, Ordering}};
 use super::spawn::AgentDefinition;
 
 /// Default read-only tool names granted to `role == "reviewer"` agents.
@@ -21,6 +21,11 @@ pub struct SubagentContext {
     /// workflow run. Set by the workflow engine; `note_finding` writes
     /// into this from tool code via `ToolCtx.workflow_findings`.
     pub workflow_findings: Option<Arc<Mutex<Vec<String>>>>,
+    /// Atomic abort flag: when set to `true`, the subagent loop will exit
+    /// at the earliest opportunity (before the next LLM call). Mirrors the
+    /// main agent's `abort_flag` mechanism so that long-running or stuck
+    /// subagents can be cancelled from the parent.
+    pub abort_flag: Option<Arc<AtomicBool>>,
 }
 
 /// Build a `SubagentContext` from an `AgentDefinition`.
@@ -48,5 +53,6 @@ pub fn build_subagent_context(def: AgentDefinition) -> SubagentContext {
         session_dir: PathBuf::new(),
         workspaces: Vec::new(),
         workflow_findings: None,
+        abort_flag: None,
     }
 }