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/main.rs

@@ -722,6 +722,7 @@ async fn main() -> Result<(), std::io::Error> {
         bot_shutdown: bot_shutdown_notifier.clone(),
         matrix_shutdown_tx: Some(Arc::clone(&matrix_shutdown_tx)),
         timer_store,
+        test_jobs: std::sync::Arc::new(std::sync::Mutex::new(std::collections::HashMap::new())),
     };
 
     let app = build_routes(ctx, whatsapp_ctx.clone(), slack_ctx.clone(), port);