fleet: preserve Bitvid TODO and remove resolved kit sidecar

docs/TODO.md.kit

@@ -1,8 +0,0 @@
-# TODO — what each area did NOT finish
-
-One section per area. Each session updates its own section before it stops: what is
-half-done, where it is, and what the next step is. Newest first inside a section.
-
-## <area id>
-
-- YYYY-MM-DD: <what is unfinished> — <where (branch, file, SHA)> — next: <step>