archiveActiveFeature was overwriting a feature's own title with the
LIVE lane's title on every clear/switch — a --title set on activation
silently disappeared. activateFeature restored stage/status/gate/CI/
stages/notes onto the live lane when switching back to a past feature,
but never links, so they vanished on reactivation. Both are fixed, with
a regression test for each (full activate/archive/reactivate round trip
for links).
Also fixes server/routes/lanes.js: the doc comment explaining GET
/:id/git's rationale had been left sitting above the newly-inserted
/:id/features routes instead of its own route.
docs/API.md's Lane features section described fields and behavior that
don't exist in the real routes (an "active" boolean, a POST response
containing "archivedPrevious", a "409 ESTALE" concurrency response) —
rewritten to match the actual request/response shapes exactly.
nntrivi2001