E2E on qwen3.8-27b without thinking

The e2e roles move to qwen3.8-27b-nothink, a LiteLLM alias for the same
model with chat_template_kwargs enable_thinking false. With thinking, a
growing share of answers ran to 2-8k tokens (two hit the 8192 cap), which
took one test from 3.5 to 20 minutes.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

tests/integration/e2e_support.py

@@ -15,8 +15,10 @@ from nisse_dev.llm import RoleMap
 
 # The end-to-end tests run every role on a local model, which costs nothing
 # per call; NISSE_E2E_MODEL overrides it (e.g. claude-haiku-4-5 for a quick,
-# paid run).
-E2E_MODEL = "qwen3.8-27b"
+# paid run). The no-thinking alias (LiteLLM: chat_template_kwargs
+# enable_thinking false): with thinking, some answers ran to 6-8k tokens,
+# minutes each, and stretched a test from 3.5 to 20 minutes.
+E2E_MODEL = "qwen3.8-27b-nothink"
 
 
 def e2e_roles() -> RoleMap: