agentx: set kimik2.7 perf-changelog pr-link to #2126

Author: hyukjlee

perf-changelog.yaml

@@ -4641,4 +4641,4 @@
     - "Add Kimi-K2.7-Code-MXFP4 agentic-coding config on MI355X (cluster:gbt350docker->mi355x-amds) via vLLM v0.24.0, TP4"
     - "Sweep KV-offloading none vs dram/LMCache at conc [1,4,8,16,32,42]; LMCache MP server + LMCacheMPConnector, dram-utilization 0.80"
     - "Recipe benchmarks/single_node/agentic/kimik2.7_fp4_mi355x.sh clones LMCache to container-local /opt/lmcache-src (pinned) so CI checkout never trips over root-owned build artifacts"
-  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/PLACEHOLDER
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2126