feat: add official Codex skill and harden task execution

Install and update artemis-use with task diagnostics and plugin guidance. Preserve cross-device file receipts, review canonical reports, guard stage transitions and reduce small history summaries. Improve exploration lifecycle, request recovery and browser live connections.

artemis/llm/reliability.py

@@ -35,6 +35,8 @@ import threading
 import time
 from typing import Any
 
+from artemis.llm.stream_guard import ToolArgumentOverflow
+
 
 class FailureCategory(StrEnum):
     RATE_LIMIT = "rate_limit"
@@ -43,6 +45,7 @@ class FailureCategory(StrEnum):
     CONNECTION = "connection"
     AUTHENTICATION = "authentication"
     BAD_REQUEST = "bad_request"
+    INVALID_OUTPUT = "invalid_output"
     CANCELLED = "cancelled"
     UNKNOWN = "unknown"
 
@@ -92,6 +95,8 @@ def classify_failure(error: BaseException) -> Failure:
     """Convert a provider/transport exception into explicit recovery decisions."""
     if isinstance(error, KeyboardInterrupt) or type(error).__name__ == "CancelledError":
         return Failure(FailureCategory.CANCELLED, False, False)
+    if isinstance(error, ToolArgumentOverflow):
+        return Failure(FailureCategory.INVALID_OUTPUT, True, True)
 
     code = extract_status_code(error)
     message = str(error).lower()
@@ -207,6 +212,10 @@ def retry_policy_for(category: FailureCategory | str) -> RetryPolicy:
         return _DEFAULT_RETRY_POLICIES[category]
     from artemis.config.settings import settings
 
+    if category is FailureCategory.INVALID_OUTPUT:
+        return _configured_policy(
+            min(1, settings.OPENAI_MAX_RETRIES), settings.OPENAI_RETRY_INTERVAL_SECONDS
+        )
     if category is FailureCategory.RATE_LIMIT:
         return _configured_policy(
             settings.OPENAI_MAX_RETRIES, settings.OPENAI_RATE_LIMIT_RETRY_SECONDS