add bundled starter agents and reliable first-run Home #114

Job	Run time
Tauri Rust checks (Linux)	2m 10s
Frontend checks and unit tests	7m 10s
Tauri Rust checks (macOS)	2m 3s
Tauri Rust checks (Windows)	3m 51s
Frontend build smoke	1m 19s
Transcript virtualization	2m 50s
	19m 23s

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