add bundled starter agents and reliable first-run Home #186

Job	Run time
Tauri Rust checks (Linux)	1m 52s
Frontend checks and unit tests	8m 16s
Tauri Rust checks (Windows)	3m 49s
Tauri Rust checks (macOS)	2m 22s
Frontend build smoke	2m 23s
Transcript virtualization	4m 16s
	22m 58s

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