diff --git a/CMakeLists.txt b/CMakeLists.txt
index 150d9446..76f2806c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -151,8 +151,7 @@ CPMAddPackage(
 CPMAddPackage(
   NAME stdexec
   GIT_REPOSITORY "https://github.com/aethernetio/stdexec.git"
-# TODO: switch to main
-  GIT_TAG "2091-compilation-failed-with-fno-exception"
+  GIT_TAG "main"
   OPTIONS "STDEXEC_BUILD_EXAMPLES OFF" "STDEXEC_INSTALL ${AE_INSTALL}"
   EXCLUDE_FROM_ALL FALSE
 )
diff --git a/opencode.json b/opencode.json
index 7cb61a91..dfedfffa 100644
--- a/opencode.json
+++ b/opencode.json
@@ -33,7 +33,6 @@
         "external_directory": "deny"
       },
       "temperature": 0.1,
-      "steps": 5
     },
     "architect": {
       "mode": "all",
@@ -56,7 +55,7 @@
     },
     "coder": {
       "mode": "subagent",
-      "model": "openai/gpt-5.4-mini",
+      "model": "openai/gpt-5.5-fast",
       "reasoningEffort": "low",
       "description": "Write c++ code",
       "prompt": "You are a focused C++ implementation agent. You receive precise instructions from @team-lead or @architect and implement only those instructions. Follow AGENTS.md, preserve existing style, avoid unrelated refactors, and keep changes minimal. If instructions are ambiguous, ask for clarification instead of inventing architecture. If a fix requires changing the architect-approved design or you are making a repeated attempt at the same failed issue, stop and ask @architect for revised instructions. Do not run or request build/test validation. After implementation, report what changed and let @team-lead coordinate validation. At the end of your response, report the actual files you changed under: Changed files. Include added, modified, deleted, or renamed files. Do not include files changed by other agents or the user.",