feat(compact): prune tool results before summarization (round 1)

examples/coding-agent/cordis.yml

@@ -50,6 +50,10 @@
 - id: token-meter
   name: '@deepseek-ai/dsh-token-meter'
 
+# Prune oversized tool output without a model call before summary compaction.
+- id: tool-result-prune
+  name: '@deepseek-ai/dsh-tool-result-prune'
+
 # Summarize an older range after measured pressure or a canonical provider overflow.
 # Service-wide policy provides pressure, retention, and one overflow-retry default.
 - id: compact-basic