fix: async run_tests to prevent zombie cargo processes blocking gates

run_tests MCP tool now spawns tests in the background and returns
immediately. Agents poll get_test_result to check completion. This
prevents zombie cargo processes from holding the build lock when the
CLI times out the MCP call before tests finish.

Also fixes agent permission mode: acceptEdits replaces invalid
allowFullAutoEdit that was causing agents to crash-loop on spawn.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/http/context.rs

@@ -6,9 +6,36 @@ use crate::state::SessionState;
 use crate::store::JsonFileStore;
 use crate::workflow::WorkflowState;
 use poem::http::StatusCode;
+use std::collections::HashMap;
+use std::path::PathBuf;
 use std::sync::Arc;
 use tokio::sync::{broadcast, mpsc, oneshot};
 
+/// A running or completed test job spawned by the `run_tests` MCP tool.
+pub struct TestJob {
+    /// The child process handle. `None` once the process has exited and results
+    /// have been collected.
+    pub child: Option<std::process::Child>,
+    /// Populated once the child exits.
+    pub result: Option<TestJobResult>,
+    /// When the job was started.
+    pub started_at: std::time::Instant,
+}
+
+/// The result of a completed test job.
+#[derive(Clone)]
+pub struct TestJobResult {
+    pub passed: bool,
+    pub exit_code: i32,
+    pub tests_passed: u64,
+    pub tests_failed: u64,
+    pub output: String,
+}
+
+/// Shared registry of in-flight and recently completed test jobs, keyed by
+/// worktree path.
+pub type TestJobRegistry = Arc<std::sync::Mutex<HashMap<PathBuf, TestJob>>>;
+
 /// The user's decision when responding to a permission dialog.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum PermissionDecision {
@@ -75,6 +102,9 @@ pub struct AppContext {
     /// spawned by the bot so that cancellations take effect in-memory rather
     /// than only on disk.
     pub timer_store: Arc<TimerStore>,
+    /// Registry of running/completed test jobs spawned by the `run_tests` MCP
+    /// tool. Keyed by worktree path so each worktree has at most one active job.
+    pub test_jobs: TestJobRegistry,
 }
 
 #[cfg(test)]
@@ -102,6 +132,7 @@ impl AppContext {
             bot_shutdown: None,
             matrix_shutdown_tx: None,
             timer_store,
+            test_jobs: Arc::new(std::sync::Mutex::new(HashMap::new())),
         }
     }
 }