dev.enginehost.html.v1 (unstable)

Signed Enginehost bundle dev.enginehost.html.v1 on the unstable channel, built from plugin/stable at 2eb12d24ab7a46268d052bf26953bec3817458ba (build 65). Install it through Enginehost rather than unpacking it by hand: the bundle is verified file by file at install time against the key pinned for this repository.