chore: bind final observer test candidate

cai

2026-08-08 c5bfc24db1ae38d8488e566a2c9ff8afd42c0e5c

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