The v1 update was a whole-object POST /tasks/{id}: omitted scalars were
zeroed, so a status-only `veans update` silently wiped a task's
description and priority. The v1->v2 migration replaced that with
PATCH /tasks/{id} carrying a JSON Merge Patch built from only the
changed fields (client.TaskPatch, all-pointer + omitempty), which fixes
this by construction — absent fields are left untouched server-side.
Pin it with the acceptance tests from the issue: a title-only and a
status-only update must send only the field(s) they change, so the
stored description and priority survive.
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