Land the v0.1 editor integration: the git_sync module (libgit2 on the SD
/sd/repo, dedicated 96KB git thread, lazy Wi-Fi, :sync push with
synced/up-to-date/failed snackbars), the boot splash (Spike 9) plus its bin
and justfile recipes, and a power-on→cursor boot-timing log. Also re-syncs
the roadmap/spikes/v0.1-product status and adds the SD hardware reference
photo.
Spikes 8-14 are a cross-release display/UX bench batch, not part of the
v0.1 integration gate — only 8 and 9 feed v0.1. Move them out of the v0.1
technical doc into their own log (with a feeds-table and dependency notes),
leaving a pointer behind; link it from the README layout map.
