Flowfield v0.2.1

• Fix an unnecessary vertical board scrollbar when horizontal scrolling is needed.
• Keep code previews at a stable height so switching files preserves the task feed's
  reading position. File lists and diffs scroll independently and fill the preview frame;
  selecting another file starts its preview at the top.
• Correct coordinator guidance to use the current task preparation contract, removing
  obsolete decision-sequence instructions.

Upgrade: restart Flowfield after updating. Schema-44 workspaces remain compatible.
Update installed project guidance through project settings and start a fresh standalone
coding conversation to use the corrected instructions.