huskies: merge 1090 refactor Migrate AgentPool::kill_all_children and kill_child_for_key to process_kill so server shutdown and stop_agent actually kill claude

server/src/agents/runtime/claude_code.rs

@@ -1,8 +1,6 @@
 //! Claude Code runtime — launches Claude Code CLI sessions as agent backends.
-use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 
-use portable_pty::ChildKiller;
 use tokio::sync::broadcast;
 
 use crate::agent_log::AgentLogWriter;
@@ -17,20 +15,13 @@ use super::{AgentEvent, AgentRuntime, RuntimeContext, RuntimeResult, RuntimeStat
 /// It wraps the existing PTY-based execution logic, preserving all streaming,
 /// token tracking, and inactivity timeout behaviour.
 pub struct ClaudeCodeRuntime {
-    child_killers: Arc<Mutex<HashMap<String, Box<dyn ChildKiller + Send + Sync>>>>,
     watcher_tx: broadcast::Sender<WatcherEvent>,
 }
 
 impl ClaudeCodeRuntime {
-    /// Create a new Claude Code runtime with shared child-killer registry and event channel.
-    pub fn new(
-        child_killers: Arc<Mutex<HashMap<String, Box<dyn ChildKiller + Send + Sync>>>>,
-        watcher_tx: broadcast::Sender<WatcherEvent>,
-    ) -> Self {
-        Self {
-            child_killers,
-            watcher_tx,
-        }
+    /// Create a new Claude Code runtime with a shared event channel.
+    pub fn new(watcher_tx: broadcast::Sender<WatcherEvent>) -> Self {
+        Self { watcher_tx }
     }
 }
 
@@ -57,7 +48,6 @@ impl AgentRuntime for ClaudeCodeRuntime {
             &event_log,
             log_writer.clone(),
             ctx.inactivity_timeout_secs,
-            Arc::clone(&self.child_killers),
             self.watcher_tx.clone(),
             ctx.session_id_to_resume.as_deref(),
             eager_record.clone(),
@@ -94,7 +84,6 @@ impl AgentRuntime for ClaudeCodeRuntime {
                     &event_log,
                     log_writer,
                     ctx.inactivity_timeout_secs,
-                    Arc::clone(&self.child_killers),
                     self.watcher_tx.clone(),
                     None, // no --resume on fallback
                     eager_record,
@@ -115,7 +104,6 @@ impl AgentRuntime for ClaudeCodeRuntime {
 
     fn stop(&self) {
         // Stopping is handled externally by the pool via kill_child_for_key().
-        // The ChildKillerGuard in pty.rs deregisters automatically on process exit.
     }
 
     fn get_status(&self) -> RuntimeStatus {