main independently wrote its own docs/handoff/20260615-handoff-70.md the
same day, so my global-sequence handoff-70 was an add/add conflict waiting
to merge. Relocate it to docs/ci/handoff/20260615-handoff-ci-01.md (its own
namespace, like docs/ci/adr) + a README index. main's handoff-70 is
untouched; the merge becomes conflict-free.
claude@clouddev1