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View allA lease broker for one test board shared by CI and coding agents
Per-caller locks don't compose when CI jobs, coding agents and I share one fragile board. What worked better was one broker that holds the board's login, leases the board with two fencing tokens and quarantines it only when an outcome is unknown.
Finding a DSI driver bug by diffing registers against the vendor image
A register diff is only as good as the blocks its baseline covers. A review of a DSI start failure ruled out every candidate register fix, yet the fault sat in a block its baseline skipped, where a masked write had left an undocumented bit set.
Sharing a host's Nix store with a builder VM
A build VM can read its host's Nix store through a read-only share. The host's files stay immutable; the VM's view of them doesn't. Its garbage collector can hide shared files behind overlay whiteouts unless the VM is told, on every start, that those files are still needed.