2b0b5e4c53
install.ps1 wrote the marker on Windows and the Rust installer now writes it, but install.sh -- the path every Mac and Linux CLI install takes -- never did. A machine set up with install.sh therefore looked uninstalled to the desktop app, which re-ran first-run bootstrap on every launch. Stamp the same schema-v1 payload install.ps1 writes, from both the staged `complete` stage and monolithic main(). An unresolvable HEAD skips the marker rather than writing one the desktop validator rejects: absent reads as a clean "bootstrap needed", malformed reads as a confusing half-state.