Fix duplicate subagent thread items #31

Job	Run time
test-js	2m 20s
Rust tests (Linux)	8m 42s
lint	1m 2s
Rust tests (macOS)	3m 31s
typecheck	1m 6s
Rust tests (Windows)	12m 56s
Tauri build (${{ matrix.platform.name }})	0s
	29m 37s

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