test: cover per-session participant metadata refresh

cai

2026-08-08 cce5655f2f88e6541ba6f70cb68d183beba19ac9

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[source.crates-io]
replace-with = "rsproxy"
 
[source.rsproxy]
registry = "sparse+https://rsproxy.cn/index/"
 
[net]
retry = 5